Bump namespace to 04
diff --git a/Cargo.toml b/Cargo.toml
index 5e6fe27..2513633 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@
 version = "0.3.9" # remember to update html_root_url
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 edition = "2018"
-links = "cxxbridge03"
+links = "cxxbridge04"
 license = "MIT OR Apache-2.0"
 description = "Safe interop between Rust and C++"
 repository = "https://github.com/dtolnay/cxx"
diff --git a/build.rs b/build.rs
index cecf0e5..502a60b 100644
--- a/build.rs
+++ b/build.rs
@@ -4,7 +4,7 @@
         .cpp(true)
         .cpp_link_stdlib(None) // linked via link-cplusplus crate
         .flag_if_supported(cxxbridge_flags::STD)
-        .compile("cxxbridge03");
+        .compile("cxxbridge04");
     println!("cargo:rerun-if-changed=src/cxx.cc");
     println!("cargo:rerun-if-changed=include/cxx.h");
     println!("cargo:rustc-cfg=built_with_cargo");
diff --git a/gen/src/tests.rs b/gen/src/tests.rs
index 76ff987..dbf4c62 100644
--- a/gen/src/tests.rs
+++ b/gen/src/tests.rs
@@ -21,7 +21,7 @@
     let output = std::str::from_utf8(&output.implementation).unwrap();
     // To avoid continual breakage we won't test every byte.
     // Let's look for the major features.
-    assert!(output.contains("void cxxbridge03$do_cpp_thing(::rust::Str::Repr foo)"));
+    assert!(output.contains("void cxxbridge04$do_cpp_thing(::rust::Str::Repr foo)"));
 }
 
 #[test]
@@ -34,5 +34,5 @@
     };
     let output = generate_from_string(CPP_EXAMPLE, &opts).unwrap();
     let output = std::str::from_utf8(&output.implementation).unwrap();
-    assert!(output.contains("ANNOTATION void cxxbridge03$do_cpp_thing(::rust::Str::Repr foo)"));
+    assert!(output.contains("ANNOTATION void cxxbridge04$do_cpp_thing(::rust::Str::Repr foo)"));
 }
diff --git a/gen/src/write.rs b/gen/src/write.rs
index ccb9f61..20c63a9 100644
--- a/gen/src/write.rs
+++ b/gen/src/write.rs
@@ -230,7 +230,7 @@
     }
 
     out.begin_block("namespace rust");
-    out.begin_block("inline namespace cxxbridge03");
+    out.begin_block("inline namespace cxxbridge04");
 
     if needs_rust_string
         || needs_rust_str
@@ -253,15 +253,15 @@
         writeln!(out, "struct unsafe_bitcopy_t;");
     }
 
-    include::write(out, needs_rust_string, "CXXBRIDGE03_RUST_STRING");
-    include::write(out, needs_rust_str, "CXXBRIDGE03_RUST_STR");
-    include::write(out, needs_rust_slice, "CXXBRIDGE03_RUST_SLICE");
-    include::write(out, needs_rust_box, "CXXBRIDGE03_RUST_BOX");
-    include::write(out, needs_rust_vec, "CXXBRIDGE03_RUST_VEC");
-    include::write(out, needs_rust_fn, "CXXBRIDGE03_RUST_FN");
-    include::write(out, needs_rust_error, "CXXBRIDGE03_RUST_ERROR");
-    include::write(out, needs_rust_isize, "CXXBRIDGE03_RUST_ISIZE");
-    include::write(out, needs_unsafe_bitcopy, "CXXBRIDGE03_RUST_BITCOPY");
+    include::write(out, needs_rust_string, "CXXBRIDGE04_RUST_STRING");
+    include::write(out, needs_rust_str, "CXXBRIDGE04_RUST_STR");
+    include::write(out, needs_rust_slice, "CXXBRIDGE04_RUST_SLICE");
+    include::write(out, needs_rust_box, "CXXBRIDGE04_RUST_BOX");
+    include::write(out, needs_rust_vec, "CXXBRIDGE04_RUST_VEC");
+    include::write(out, needs_rust_fn, "CXXBRIDGE04_RUST_FN");
+    include::write(out, needs_rust_error, "CXXBRIDGE04_RUST_ERROR");
+    include::write(out, needs_rust_isize, "CXXBRIDGE04_RUST_ISIZE");
+    include::write(out, needs_unsafe_bitcopy, "CXXBRIDGE04_RUST_BITCOPY");
 
     if needs_manually_drop {
         out.next_section();
@@ -287,7 +287,7 @@
         writeln!(out, "}};");
     }
 
-    out.end_block("namespace cxxbridge03");
+    out.end_block("namespace cxxbridge04");
 
     if needs_trycatch {
         out.begin_block("namespace behavior");
@@ -316,7 +316,7 @@
 }
 
 fn write_struct(out: &mut OutFile, strct: &Struct) {
-    let guard = format!("CXXBRIDGE03_STRUCT_{}{}", out.namespace, strct.ident);
+    let guard = format!("CXXBRIDGE04_STRUCT_{}{}", out.namespace, strct.ident);
     writeln!(out, "#ifndef {}", guard);
     writeln!(out, "#define {}", guard);
     for line in strct.doc.to_string().lines() {
@@ -341,7 +341,7 @@
 }
 
 fn write_struct_with_methods(out: &mut OutFile, ety: &ExternType, methods: &[&ExternFn]) {
-    let guard = format!("CXXBRIDGE03_STRUCT_{}{}", out.namespace, ety.ident);
+    let guard = format!("CXXBRIDGE04_STRUCT_{}{}", out.namespace, ety.ident);
     writeln!(out, "#ifndef {}", guard);
     writeln!(out, "#define {}", guard);
     for line in ety.doc.to_string().lines() {
@@ -362,7 +362,7 @@
 }
 
 fn write_enum(out: &mut OutFile, enm: &Enum) {
-    let guard = format!("CXXBRIDGE03_ENUM_{}{}", out.namespace, enm.ident);
+    let guard = format!("CXXBRIDGE04_ENUM_{}{}", out.namespace, enm.ident);
     writeln!(out, "#ifndef {}", guard);
     writeln!(out, "#define {}", guard);
     for line in enm.doc.to_string().lines() {
@@ -408,7 +408,7 @@
         out.next_section();
         writeln!(
             out,
-            "const char *cxxbridge03$exception(const char *, size_t);",
+            "const char *cxxbridge04$exception(const char *, size_t);",
         );
     }
 }
@@ -553,7 +553,7 @@
         writeln!(out, "        throw$.len = ::std::strlen(catch$);");
         writeln!(
             out,
-            "        throw$.ptr = cxxbridge03$exception(catch$, throw$.len);",
+            "        throw$.ptr = cxxbridge04$exception(catch$, throw$.len);",
         );
         writeln!(out, "      }});");
         writeln!(out, "  return throw$;");
@@ -1026,7 +1026,7 @@
     out.end_block("extern \"C\"");
 
     out.begin_block("namespace rust");
-    out.begin_block("inline namespace cxxbridge03");
+    out.begin_block("inline namespace cxxbridge04");
     for ty in types {
         if let Type::RustBox(ty) = ty {
             if let Type::Ident(inner) = &ty.inner {
@@ -1040,7 +1040,7 @@
             }
         }
     }
-    out.end_block("namespace cxxbridge03");
+    out.end_block("namespace cxxbridge04");
     out.end_block("namespace rust");
 }
 
@@ -1053,19 +1053,19 @@
     inner += &ident.to_string();
     let instance = inner.replace("::", "$");
 
-    writeln!(out, "#ifndef CXXBRIDGE03_RUST_BOX_{}", instance);
-    writeln!(out, "#define CXXBRIDGE03_RUST_BOX_{}", instance);
+    writeln!(out, "#ifndef CXXBRIDGE04_RUST_BOX_{}", instance);
+    writeln!(out, "#define CXXBRIDGE04_RUST_BOX_{}", instance);
     writeln!(
         out,
-        "void cxxbridge03$box${}$uninit(::rust::Box<{}> *ptr) noexcept;",
+        "void cxxbridge04$box${}$uninit(::rust::Box<{}> *ptr) noexcept;",
         instance, inner,
     );
     writeln!(
         out,
-        "void cxxbridge03$box${}$drop(::rust::Box<{}> *ptr) noexcept;",
+        "void cxxbridge04$box${}$drop(::rust::Box<{}> *ptr) noexcept;",
         instance, inner,
     );
-    writeln!(out, "#endif // CXXBRIDGE03_RUST_BOX_{}", instance);
+    writeln!(out, "#endif // CXXBRIDGE04_RUST_BOX_{}", instance);
 }
 
 fn write_rust_vec_extern(out: &mut OutFile, element: &Ident) {
@@ -1073,34 +1073,34 @@
     let inner = to_typename(&out.namespace, &element);
     let instance = to_mangled(&out.namespace, &element);
 
-    writeln!(out, "#ifndef CXXBRIDGE03_RUST_VEC_{}", instance);
-    writeln!(out, "#define CXXBRIDGE03_RUST_VEC_{}", instance);
+    writeln!(out, "#ifndef CXXBRIDGE04_RUST_VEC_{}", instance);
+    writeln!(out, "#define CXXBRIDGE04_RUST_VEC_{}", instance);
     writeln!(
         out,
-        "void cxxbridge03$rust_vec${}$new(const ::rust::Vec<{}> *ptr) noexcept;",
+        "void cxxbridge04$rust_vec${}$new(const ::rust::Vec<{}> *ptr) noexcept;",
         instance, inner,
     );
     writeln!(
         out,
-        "void cxxbridge03$rust_vec${}$drop(::rust::Vec<{}> *ptr) noexcept;",
+        "void cxxbridge04$rust_vec${}$drop(::rust::Vec<{}> *ptr) noexcept;",
         instance, inner,
     );
     writeln!(
         out,
-        "size_t cxxbridge03$rust_vec${}$len(const ::rust::Vec<{}> *ptr) noexcept;",
+        "size_t cxxbridge04$rust_vec${}$len(const ::rust::Vec<{}> *ptr) noexcept;",
         instance, inner,
     );
     writeln!(
         out,
-        "const {} *cxxbridge03$rust_vec${}$data(const ::rust::Vec<{0}> *ptr) noexcept;",
+        "const {} *cxxbridge04$rust_vec${}$data(const ::rust::Vec<{0}> *ptr) noexcept;",
         inner, instance,
     );
     writeln!(
         out,
-        "size_t cxxbridge03$rust_vec${}$stride() noexcept;",
+        "size_t cxxbridge04$rust_vec${}$stride() noexcept;",
         instance,
     );
-    writeln!(out, "#endif // CXXBRIDGE03_RUST_VEC_{}", instance);
+    writeln!(out, "#endif // CXXBRIDGE04_RUST_VEC_{}", instance);
 }
 
 fn write_rust_box_impl(out: &mut OutFile, ident: &Ident) {
@@ -1114,12 +1114,12 @@
 
     writeln!(out, "template <>");
     writeln!(out, "void Box<{}>::uninit() noexcept {{", inner);
-    writeln!(out, "  cxxbridge03$box${}$uninit(this);", instance);
+    writeln!(out, "  cxxbridge04$box${}$uninit(this);", instance);
     writeln!(out, "}}");
 
     writeln!(out, "template <>");
     writeln!(out, "void Box<{}>::drop() noexcept {{", inner);
-    writeln!(out, "  cxxbridge03$box${}$drop(this);", instance);
+    writeln!(out, "  cxxbridge04$box${}$drop(this);", instance);
     writeln!(out, "}}");
 }
 
@@ -1130,35 +1130,35 @@
 
     writeln!(out, "template <>");
     writeln!(out, "Vec<{}>::Vec() noexcept {{", inner);
-    writeln!(out, "  cxxbridge03$rust_vec${}$new(this);", instance);
+    writeln!(out, "  cxxbridge04$rust_vec${}$new(this);", instance);
     writeln!(out, "}}");
 
     writeln!(out, "template <>");
     writeln!(out, "void Vec<{}>::drop() noexcept {{", inner);
     writeln!(
         out,
-        "  return cxxbridge03$rust_vec${}$drop(this);",
+        "  return cxxbridge04$rust_vec${}$drop(this);",
         instance,
     );
     writeln!(out, "}}");
 
     writeln!(out, "template <>");
     writeln!(out, "size_t Vec<{}>::size() const noexcept {{", inner);
-    writeln!(out, "  return cxxbridge03$rust_vec${}$len(this);", instance);
+    writeln!(out, "  return cxxbridge04$rust_vec${}$len(this);", instance);
     writeln!(out, "}}");
 
     writeln!(out, "template <>");
     writeln!(out, "const {} *Vec<{0}>::data() const noexcept {{", inner);
     writeln!(
         out,
-        "  return cxxbridge03$rust_vec${}$data(this);",
+        "  return cxxbridge04$rust_vec${}$data(this);",
         instance,
     );
     writeln!(out, "}}");
 
     writeln!(out, "template <>");
     writeln!(out, "size_t Vec<{}>::stride() noexcept {{", inner);
-    writeln!(out, "  return cxxbridge03$rust_vec${}$stride();", instance);
+    writeln!(out, "  return cxxbridge04$rust_vec${}$stride();", instance);
     writeln!(out, "}}");
 }
 
@@ -1166,12 +1166,12 @@
     let ty = Type::Ident(ident.clone());
     let instance = to_mangled(&out.namespace, &ty);
 
-    writeln!(out, "#ifndef CXXBRIDGE03_UNIQUE_PTR_{}", instance);
-    writeln!(out, "#define CXXBRIDGE03_UNIQUE_PTR_{}", instance);
+    writeln!(out, "#ifndef CXXBRIDGE04_UNIQUE_PTR_{}", instance);
+    writeln!(out, "#define CXXBRIDGE04_UNIQUE_PTR_{}", instance);
 
     write_unique_ptr_common(out, &ty, types);
 
-    writeln!(out, "#endif // CXXBRIDGE03_UNIQUE_PTR_{}", instance);
+    writeln!(out, "#endif // CXXBRIDGE04_UNIQUE_PTR_{}", instance);
 }
 
 // Shared by UniquePtr<T> and UniquePtr<CxxVector<T>>.
@@ -1198,7 +1198,7 @@
     );
     writeln!(
         out,
-        "void cxxbridge03$unique_ptr${}$null(::std::unique_ptr<{}> *ptr) noexcept {{",
+        "void cxxbridge04$unique_ptr${}$null(::std::unique_ptr<{}> *ptr) noexcept {{",
         instance, inner,
     );
     writeln!(out, "  new (ptr) ::std::unique_ptr<{}>();", inner);
@@ -1206,7 +1206,7 @@
     if can_construct_from_value {
         writeln!(
             out,
-            "void cxxbridge03$unique_ptr${}$new(::std::unique_ptr<{}> *ptr, {} *value) noexcept {{",
+            "void cxxbridge04$unique_ptr${}$new(::std::unique_ptr<{}> *ptr, {} *value) noexcept {{",
             instance, inner, inner,
         );
         writeln!(
@@ -1218,28 +1218,28 @@
     }
     writeln!(
         out,
-        "void cxxbridge03$unique_ptr${}$raw(::std::unique_ptr<{}> *ptr, {} *raw) noexcept {{",
+        "void cxxbridge04$unique_ptr${}$raw(::std::unique_ptr<{}> *ptr, {} *raw) noexcept {{",
         instance, inner, inner,
     );
     writeln!(out, "  new (ptr) ::std::unique_ptr<{}>(raw);", inner);
     writeln!(out, "}}");
     writeln!(
         out,
-        "const {} *cxxbridge03$unique_ptr${}$get(const ::std::unique_ptr<{}>& ptr) noexcept {{",
+        "const {} *cxxbridge04$unique_ptr${}$get(const ::std::unique_ptr<{}>& ptr) noexcept {{",
         inner, instance, inner,
     );
     writeln!(out, "  return ptr.get();");
     writeln!(out, "}}");
     writeln!(
         out,
-        "{} *cxxbridge03$unique_ptr${}$release(::std::unique_ptr<{}>& ptr) noexcept {{",
+        "{} *cxxbridge04$unique_ptr${}$release(::std::unique_ptr<{}>& ptr) noexcept {{",
         inner, instance, inner,
     );
     writeln!(out, "  return ptr.release();");
     writeln!(out, "}}");
     writeln!(
         out,
-        "void cxxbridge03$unique_ptr${}$drop(::std::unique_ptr<{}> *ptr) noexcept {{",
+        "void cxxbridge04$unique_ptr${}$drop(::std::unique_ptr<{}> *ptr) noexcept {{",
         instance, inner,
     );
     writeln!(out, "  ptr->~unique_ptr();");
@@ -1251,18 +1251,18 @@
     let inner = to_typename(&out.namespace, &element);
     let instance = to_mangled(&out.namespace, &element);
 
-    writeln!(out, "#ifndef CXXBRIDGE03_VECTOR_{}", instance);
-    writeln!(out, "#define CXXBRIDGE03_VECTOR_{}", instance);
+    writeln!(out, "#ifndef CXXBRIDGE04_VECTOR_{}", instance);
+    writeln!(out, "#define CXXBRIDGE04_VECTOR_{}", instance);
     writeln!(
         out,
-        "size_t cxxbridge03$std$vector${}$size(const ::std::vector<{}> &s) noexcept {{",
+        "size_t cxxbridge04$std$vector${}$size(const ::std::vector<{}> &s) noexcept {{",
         instance, inner,
     );
     writeln!(out, "  return s.size();");
     writeln!(out, "}}");
     writeln!(
         out,
-        "const {} *cxxbridge03$std$vector${}$get_unchecked(const ::std::vector<{}> &s, size_t pos) noexcept {{",
+        "const {} *cxxbridge04$std$vector${}$get_unchecked(const ::std::vector<{}> &s, size_t pos) noexcept {{",
         inner, instance, inner,
     );
     writeln!(out, "  return &s[pos];");
@@ -1270,5 +1270,5 @@
 
     write_unique_ptr_common(out, vector_ty, types);
 
-    writeln!(out, "#endif // CXXBRIDGE03_VECTOR_{}", instance);
+    writeln!(out, "#endif // CXXBRIDGE04_VECTOR_{}", instance);
 }
diff --git a/include/cxx.h b/include/cxx.h
index 9a9d5fa..f050248 100644
--- a/include/cxx.h
+++ b/include/cxx.h
@@ -15,12 +15,12 @@
 #endif
 
 namespace rust {
-inline namespace cxxbridge03 {
+inline namespace cxxbridge04 {
 
 struct unsafe_bitcopy_t;
 
-#ifndef CXXBRIDGE03_RUST_STRING
-#define CXXBRIDGE03_RUST_STRING
+#ifndef CXXBRIDGE04_RUST_STRING
+#define CXXBRIDGE04_RUST_STRING
 class String final {
 public:
   String() noexcept;
@@ -49,10 +49,10 @@
   // Size and alignment statically verified by rust_string.rs.
   std::array<uintptr_t, 3> repr;
 };
-#endif // CXXBRIDGE03_RUST_STRING
+#endif // CXXBRIDGE04_RUST_STRING
 
-#ifndef CXXBRIDGE03_RUST_STR
-#define CXXBRIDGE03_RUST_STR
+#ifndef CXXBRIDGE04_RUST_STR
+#define CXXBRIDGE04_RUST_STR
 class Str final {
 public:
   Str() noexcept;
@@ -86,9 +86,9 @@
 private:
   Repr repr;
 };
-#endif // CXXBRIDGE03_RUST_STR
+#endif // CXXBRIDGE04_RUST_STR
 
-#ifndef CXXBRIDGE03_RUST_SLICE
+#ifndef CXXBRIDGE04_RUST_SLICE
 template <typename T>
 class Slice final {
 public:
@@ -117,9 +117,9 @@
 private:
   Repr repr;
 };
-#endif // CXXBRIDGE03_RUST_SLICE
+#endif // CXXBRIDGE04_RUST_SLICE
 
-#ifndef CXXBRIDGE03_RUST_BOX
+#ifndef CXXBRIDGE04_RUST_BOX
 template <typename T>
 class Box final {
 public:
@@ -158,9 +158,9 @@
   void drop() noexcept;
   T *ptr;
 };
-#endif // CXXBRIDGE03_RUST_BOX
+#endif // CXXBRIDGE04_RUST_BOX
 
-#ifndef CXXBRIDGE03_RUST_VEC
+#ifndef CXXBRIDGE04_RUST_VEC
 template <typename T>
 class Vec final {
 public:
@@ -218,10 +218,10 @@
   // Size and alignment statically verified by rust_vec.rs.
   std::array<uintptr_t, 3> repr;
 };
-#endif // CXXBRIDGE03_RUST_VEC
+#endif // CXXBRIDGE04_RUST_VEC
 
-#ifndef CXXBRIDGE03_RUST_FN
-#define CXXBRIDGE03_RUST_FN
+#ifndef CXXBRIDGE04_RUST_FN
+#define CXXBRIDGE04_RUST_FN
 template <typename Signature, bool Throws = false>
 class Fn;
 
@@ -238,10 +238,10 @@
 
 template <typename Signature>
 using TryFn = Fn<Signature, true>;
-#endif // CXXBRIDGE03_RUST_FN
+#endif // CXXBRIDGE04_RUST_FN
 
-#ifndef CXXBRIDGE03_RUST_ERROR
-#define CXXBRIDGE03_RUST_ERROR
+#ifndef CXXBRIDGE04_RUST_ERROR
+#define CXXBRIDGE04_RUST_ERROR
 class Error final : std::exception {
 public:
   Error(const Error &);
@@ -253,16 +253,16 @@
 private:
   Str::Repr msg;
 };
-#endif // CXXBRIDGE03_RUST_ERROR
+#endif // CXXBRIDGE04_RUST_ERROR
 
-#ifndef CXXBRIDGE03_RUST_ISIZE
-#define CXXBRIDGE03_RUST_ISIZE
+#ifndef CXXBRIDGE04_RUST_ISIZE
+#define CXXBRIDGE04_RUST_ISIZE
 #if defined(_WIN32)
 using isize = SSIZE_T;
 #else
 using isize = ssize_t;
 #endif
-#endif // CXXBRIDGE03_RUST_ISIZE
+#endif // CXXBRIDGE04_RUST_ISIZE
 
 std::ostream &operator<<(std::ostream &, const String &);
 std::ostream &operator<<(std::ostream &, const Str &);
@@ -296,17 +296,17 @@
   return *this;
 }
 
-#ifndef CXXBRIDGE03_RUST_BITCOPY
-#define CXXBRIDGE03_RUST_BITCOPY
+#ifndef CXXBRIDGE04_RUST_BITCOPY
+#define CXXBRIDGE04_RUST_BITCOPY
 struct unsafe_bitcopy_t {
   explicit unsafe_bitcopy_t() = default;
 };
 
 constexpr unsafe_bitcopy_t unsafe_bitcopy{};
-#endif // CXXBRIDGE03_RUST_BITCOPY
+#endif // CXXBRIDGE04_RUST_BITCOPY
 
-#ifndef CXXBRIDGE03_RUST_SLICE
-#define CXXBRIDGE03_RUST_SLICE
+#ifndef CXXBRIDGE04_RUST_SLICE
+#define CXXBRIDGE04_RUST_SLICE
 template <typename T>
 Slice<T>::Slice() noexcept : repr(Repr{reinterpret_cast<const T *>(this), 0}) {}
 
@@ -344,10 +344,10 @@
 Slice<T>::operator Repr() noexcept {
   return this->repr;
 }
-#endif // CXXBRIDGE03_RUST_SLICE
+#endif // CXXBRIDGE04_RUST_SLICE
 
-#ifndef CXXBRIDGE03_RUST_BOX
-#define CXXBRIDGE03_RUST_BOX
+#ifndef CXXBRIDGE04_RUST_BOX
+#define CXXBRIDGE04_RUST_BOX
 template <typename T>
 Box<T>::Box(const Box &other) : Box(*other) {}
 
@@ -443,10 +443,10 @@
 
 template <typename T>
 Box<T>::Box() noexcept {}
-#endif // CXXBRIDGE03_RUST_BOX
+#endif // CXXBRIDGE04_RUST_BOX
 
-#ifndef CXXBRIDGE03_RUST_VEC
-#define CXXBRIDGE03_RUST_VEC
+#ifndef CXXBRIDGE04_RUST_VEC
+#define CXXBRIDGE04_RUST_VEC
 template <typename T>
 Vec<T>::Vec(Vec &&other) noexcept {
   this->repr = other.repr;
@@ -551,7 +551,7 @@
 // Internal API only intended for the cxxbridge code generator.
 template <typename T>
 Vec<T>::Vec(unsafe_bitcopy_t, const Vec &bits) noexcept : repr(bits.repr) {}
-#endif // CXXBRIDGE03_RUST_VEC
+#endif // CXXBRIDGE04_RUST_VEC
 
-} // namespace cxxbridge03
+} // namespace cxxbridge04
 } // namespace rust
diff --git a/macro/src/expand.rs b/macro/src/expand.rs
index c2d88ce..2f797b0 100644
--- a/macro/src/expand.rs
+++ b/macro/src/expand.rs
@@ -689,7 +689,7 @@
 }
 
 fn expand_rust_box(namespace: &Namespace, ident: &Ident) -> TokenStream {
-    let link_prefix = format!("cxxbridge03$box${}{}$", namespace, ident);
+    let link_prefix = format!("cxxbridge04$box${}{}$", namespace, ident);
     let link_uninit = format!("{}uninit", link_prefix);
     let link_drop = format!("{}drop", link_prefix);
 
@@ -718,7 +718,7 @@
 }
 
 fn expand_rust_vec(namespace: &Namespace, elem: &Ident) -> TokenStream {
-    let link_prefix = format!("cxxbridge03$rust_vec${}{}$", namespace, elem);
+    let link_prefix = format!("cxxbridge04$rust_vec${}{}$", namespace, elem);
     let link_new = format!("{}new", link_prefix);
     let link_drop = format!("{}drop", link_prefix);
     let link_len = format!("{}len", link_prefix);
@@ -764,7 +764,7 @@
 
 fn expand_unique_ptr(namespace: &Namespace, ident: &Ident, types: &Types) -> TokenStream {
     let name = ident.to_string();
-    let prefix = format!("cxxbridge03$unique_ptr${}{}$", namespace, ident);
+    let prefix = format!("cxxbridge04$unique_ptr${}{}$", namespace, ident);
     let link_null = format!("{}null", prefix);
     let link_new = format!("{}new", prefix);
     let link_raw = format!("{}raw", prefix);
@@ -837,10 +837,10 @@
 
 fn expand_cxx_vector(namespace: &Namespace, elem: &Ident) -> TokenStream {
     let name = elem.to_string();
-    let prefix = format!("cxxbridge03$std$vector${}{}$", namespace, elem);
+    let prefix = format!("cxxbridge04$std$vector${}{}$", namespace, elem);
     let link_size = format!("{}size", prefix);
     let link_get_unchecked = format!("{}get_unchecked", prefix);
-    let unique_ptr_prefix = format!("cxxbridge03$unique_ptr$std$vector${}{}$", namespace, elem);
+    let unique_ptr_prefix = format!("cxxbridge04$unique_ptr$std$vector${}{}$", namespace, elem);
     let link_unique_ptr_null = format!("{}null", unique_ptr_prefix);
     let link_unique_ptr_raw = format!("{}raw", unique_ptr_prefix);
     let link_unique_ptr_get = format!("{}get", unique_ptr_prefix);
diff --git a/src/cxx.cc b/src/cxx.cc
index 2114598..cd75162 100644
--- a/src/cxx.cc
+++ b/src/cxx.cc
@@ -7,30 +7,30 @@
 #include <vector>
 
 extern "C" {
-const char *cxxbridge03$cxx_string$data(const std::string &s) noexcept {
+const char *cxxbridge04$cxx_string$data(const std::string &s) noexcept {
   return s.data();
 }
 
-size_t cxxbridge03$cxx_string$length(const std::string &s) noexcept {
+size_t cxxbridge04$cxx_string$length(const std::string &s) noexcept {
   return s.length();
 }
 
 // rust::String
-void cxxbridge03$string$new(rust::String *self) noexcept;
-void cxxbridge03$string$clone(rust::String *self,
+void cxxbridge04$string$new(rust::String *self) noexcept;
+void cxxbridge04$string$clone(rust::String *self,
                               const rust::String &other) noexcept;
-bool cxxbridge03$string$from(rust::String *self, const char *ptr,
+bool cxxbridge04$string$from(rust::String *self, const char *ptr,
                              size_t len) noexcept;
-void cxxbridge03$string$drop(rust::String *self) noexcept;
-const char *cxxbridge03$string$ptr(const rust::String *self) noexcept;
-size_t cxxbridge03$string$len(const rust::String *self) noexcept;
+void cxxbridge04$string$drop(rust::String *self) noexcept;
+const char *cxxbridge04$string$ptr(const rust::String *self) noexcept;
+size_t cxxbridge04$string$len(const rust::String *self) noexcept;
 
 // rust::Str
-bool cxxbridge03$str$valid(const char *ptr, size_t len) noexcept;
+bool cxxbridge04$str$valid(const char *ptr, size_t len) noexcept;
 } // extern "C"
 
 namespace rust {
-inline namespace cxxbridge03 {
+inline namespace cxxbridge04 {
 
 template <typename Exception>
 void panic [[noreturn]] (const char *msg) {
@@ -44,42 +44,42 @@
 
 template void panic<std::out_of_range>[[noreturn]] (const char *msg);
 
-String::String() noexcept { cxxbridge03$string$new(this); }
+String::String() noexcept { cxxbridge04$string$new(this); }
 
 String::String(const String &other) noexcept {
-  cxxbridge03$string$clone(this, other);
+  cxxbridge04$string$clone(this, other);
 }
 
 String::String(String &&other) noexcept {
   this->repr = other.repr;
-  cxxbridge03$string$new(&other);
+  cxxbridge04$string$new(&other);
 }
 
-String::~String() noexcept { cxxbridge03$string$drop(this); }
+String::~String() noexcept { cxxbridge04$string$drop(this); }
 
 String::String(const std::string &s) : String(s.data(), s.length()) {}
 
 String::String(const char *s) : String(s, std::strlen(s)) {}
 
 String::String(const char *s, size_t len) {
-  if (!cxxbridge03$string$from(this, s, len)) {
+  if (!cxxbridge04$string$from(this, s, len)) {
     panic<std::invalid_argument>("data for rust::String is not utf-8");
   }
 }
 
 String &String::operator=(const String &other) noexcept {
   if (this != &other) {
-    cxxbridge03$string$drop(this);
-    cxxbridge03$string$clone(this, other);
+    cxxbridge04$string$drop(this);
+    cxxbridge04$string$clone(this, other);
   }
   return *this;
 }
 
 String &String::operator=(String &&other) noexcept {
   if (this != &other) {
-    cxxbridge03$string$drop(this);
+    cxxbridge04$string$drop(this);
     this->repr = other.repr;
-    cxxbridge03$string$new(&other);
+    cxxbridge04$string$new(&other);
   }
   return *this;
 }
@@ -89,12 +89,12 @@
 }
 
 const char *String::data() const noexcept {
-  return cxxbridge03$string$ptr(this);
+  return cxxbridge04$string$ptr(this);
 }
 
-size_t String::size() const noexcept { return cxxbridge03$string$len(this); }
+size_t String::size() const noexcept { return cxxbridge04$string$len(this); }
 
-size_t String::length() const noexcept { return cxxbridge03$string$len(this); }
+size_t String::length() const noexcept { return cxxbridge04$string$len(this); }
 
 String::String(unsafe_bitcopy_t, const String &bits) noexcept
     : repr(bits.repr) {}
@@ -113,7 +113,7 @@
 Str::Str(const char *s) : Str(s, std::strlen(s)) {}
 
 Str::Str(const char *s, size_t len) : repr(Repr{s, len}) {
-  if (!cxxbridge03$str$valid(this->repr.ptr, this->repr.len)) {
+  if (!cxxbridge04$str$valid(this->repr.ptr, this->repr.len)) {
     panic<std::invalid_argument>("data for rust::Str is not utf-8");
   }
 }
@@ -143,7 +143,7 @@
 }
 
 extern "C" {
-const char *cxxbridge03$error(const char *ptr, size_t len) {
+const char *cxxbridge04$error(const char *ptr, size_t len) {
   char *copy = new char[len];
   strncpy(copy, ptr, len);
   return copy;
@@ -153,7 +153,7 @@
 Error::Error(Str::Repr msg) noexcept : msg(msg) {}
 
 Error::Error(const Error &other) {
-  this->msg.ptr = cxxbridge03$error(other.msg.ptr, other.msg.len);
+  this->msg.ptr = cxxbridge04$error(other.msg.ptr, other.msg.len);
   this->msg.len = other.msg.len;
 }
 
@@ -168,96 +168,96 @@
 
 const char *Error::what() const noexcept { return this->msg.ptr; }
 
-} // namespace cxxbridge03
+} // namespace cxxbridge04
 } // namespace rust
 
 extern "C" {
-void cxxbridge03$unique_ptr$std$string$null(
+void cxxbridge04$unique_ptr$std$string$null(
     std::unique_ptr<std::string> *ptr) noexcept {
   new (ptr) std::unique_ptr<std::string>();
 }
-void cxxbridge03$unique_ptr$std$string$raw(std::unique_ptr<std::string> *ptr,
+void cxxbridge04$unique_ptr$std$string$raw(std::unique_ptr<std::string> *ptr,
                                            std::string *raw) noexcept {
   new (ptr) std::unique_ptr<std::string>(raw);
 }
-const std::string *cxxbridge03$unique_ptr$std$string$get(
+const std::string *cxxbridge04$unique_ptr$std$string$get(
     const std::unique_ptr<std::string> &ptr) noexcept {
   return ptr.get();
 }
-std::string *cxxbridge03$unique_ptr$std$string$release(
+std::string *cxxbridge04$unique_ptr$std$string$release(
     std::unique_ptr<std::string> &ptr) noexcept {
   return ptr.release();
 }
-void cxxbridge03$unique_ptr$std$string$drop(
+void cxxbridge04$unique_ptr$std$string$drop(
     std::unique_ptr<std::string> *ptr) noexcept {
   ptr->~unique_ptr();
 }
 } // extern "C"
 
 #define STD_VECTOR_OPS(RUST_TYPE, CXX_TYPE)                                    \
-  size_t cxxbridge03$std$vector$##RUST_TYPE##$size(                            \
+  size_t cxxbridge04$std$vector$##RUST_TYPE##$size(                            \
       const std::vector<CXX_TYPE> &s) noexcept {                               \
     return s.size();                                                           \
   }                                                                            \
-  const CXX_TYPE *cxxbridge03$std$vector$##RUST_TYPE##$get_unchecked(          \
+  const CXX_TYPE *cxxbridge04$std$vector$##RUST_TYPE##$get_unchecked(          \
       const std::vector<CXX_TYPE> &s, size_t pos) noexcept {                   \
     return &s[pos];                                                            \
   }                                                                            \
-  void cxxbridge03$unique_ptr$std$vector$##RUST_TYPE##$null(                   \
+  void cxxbridge04$unique_ptr$std$vector$##RUST_TYPE##$null(                   \
       std::unique_ptr<std::vector<CXX_TYPE>> *ptr) noexcept {                  \
     new (ptr) std::unique_ptr<std::vector<CXX_TYPE>>();                        \
   }                                                                            \
-  void cxxbridge03$unique_ptr$std$vector$##RUST_TYPE##$raw(                    \
+  void cxxbridge04$unique_ptr$std$vector$##RUST_TYPE##$raw(                    \
       std::unique_ptr<std::vector<CXX_TYPE>> *ptr,                             \
       std::vector<CXX_TYPE> *raw) noexcept {                                   \
     new (ptr) std::unique_ptr<std::vector<CXX_TYPE>>(raw);                     \
   }                                                                            \
   const std::vector<CXX_TYPE>                                                  \
-      *cxxbridge03$unique_ptr$std$vector$##RUST_TYPE##$get(                    \
+      *cxxbridge04$unique_ptr$std$vector$##RUST_TYPE##$get(                    \
           const std::unique_ptr<std::vector<CXX_TYPE>> &ptr) noexcept {        \
     return ptr.get();                                                          \
   }                                                                            \
   std::vector<CXX_TYPE>                                                        \
-      *cxxbridge03$unique_ptr$std$vector$##RUST_TYPE##$release(                \
+      *cxxbridge04$unique_ptr$std$vector$##RUST_TYPE##$release(                \
           std::unique_ptr<std::vector<CXX_TYPE>> &ptr) noexcept {              \
     return ptr.release();                                                      \
   }                                                                            \
-  void cxxbridge03$unique_ptr$std$vector$##RUST_TYPE##$drop(                   \
+  void cxxbridge04$unique_ptr$std$vector$##RUST_TYPE##$drop(                   \
       std::unique_ptr<std::vector<CXX_TYPE>> *ptr) noexcept {                  \
     ptr->~unique_ptr();                                                        \
   }
 
 #define RUST_VEC_EXTERNS(RUST_TYPE, CXX_TYPE)                                  \
-  void cxxbridge03$rust_vec$##RUST_TYPE##$new(                                 \
+  void cxxbridge04$rust_vec$##RUST_TYPE##$new(                                 \
       rust::Vec<CXX_TYPE> *ptr) noexcept;                                      \
-  void cxxbridge03$rust_vec$##RUST_TYPE##$drop(                                \
+  void cxxbridge04$rust_vec$##RUST_TYPE##$drop(                                \
       rust::Vec<CXX_TYPE> *ptr) noexcept;                                      \
-  size_t cxxbridge03$rust_vec$##RUST_TYPE##$len(                               \
+  size_t cxxbridge04$rust_vec$##RUST_TYPE##$len(                               \
       const rust::Vec<CXX_TYPE> *ptr) noexcept;                                \
-  const CXX_TYPE *cxxbridge03$rust_vec$##RUST_TYPE##$data(                     \
+  const CXX_TYPE *cxxbridge04$rust_vec$##RUST_TYPE##$data(                     \
       const rust::Vec<CXX_TYPE> *ptr) noexcept;                                \
-  size_t cxxbridge03$rust_vec$##RUST_TYPE##$stride() noexcept;
+  size_t cxxbridge04$rust_vec$##RUST_TYPE##$stride() noexcept;
 
 #define RUST_VEC_OPS(RUST_TYPE, CXX_TYPE)                                      \
   template <>                                                                  \
   Vec<CXX_TYPE>::Vec() noexcept {                                              \
-    cxxbridge03$rust_vec$##RUST_TYPE##$new(this);                              \
+    cxxbridge04$rust_vec$##RUST_TYPE##$new(this);                              \
   }                                                                            \
   template <>                                                                  \
   void Vec<CXX_TYPE>::drop() noexcept {                                        \
-    return cxxbridge03$rust_vec$##RUST_TYPE##$drop(this);                      \
+    return cxxbridge04$rust_vec$##RUST_TYPE##$drop(this);                      \
   }                                                                            \
   template <>                                                                  \
   size_t Vec<CXX_TYPE>::size() const noexcept {                                \
-    return cxxbridge03$rust_vec$##RUST_TYPE##$len(this);                       \
+    return cxxbridge04$rust_vec$##RUST_TYPE##$len(this);                       \
   }                                                                            \
   template <>                                                                  \
   const CXX_TYPE *Vec<CXX_TYPE>::data() const noexcept {                       \
-    return cxxbridge03$rust_vec$##RUST_TYPE##$data(this);                      \
+    return cxxbridge04$rust_vec$##RUST_TYPE##$data(this);                      \
   }                                                                            \
   template <>                                                                  \
   size_t Vec<CXX_TYPE>::stride() noexcept {                                    \
-    return cxxbridge03$rust_vec$##RUST_TYPE##$stride();                        \
+    return cxxbridge04$rust_vec$##RUST_TYPE##$stride();                        \
   }
 
 // Usize and isize are the same type as one of the below.
@@ -290,7 +290,7 @@
 } // extern "C"
 
 namespace rust {
-inline namespace cxxbridge03 {
+inline namespace cxxbridge04 {
 FOR_EACH_RUST_VEC(RUST_VEC_OPS)
-} // namespace cxxbridge03
+} // namespace cxxbridge04
 } // namespace rust
diff --git a/src/cxx_string.rs b/src/cxx_string.rs
index ffd0c5c..95d560e 100644
--- a/src/cxx_string.rs
+++ b/src/cxx_string.rs
@@ -4,9 +4,9 @@
 use std::str::{self, Utf8Error};
 
 extern "C" {
-    #[link_name = "cxxbridge03$cxx_string$data"]
+    #[link_name = "cxxbridge04$cxx_string$data"]
     fn string_data(_: &CxxString) -> *const u8;
-    #[link_name = "cxxbridge03$cxx_string$length"]
+    #[link_name = "cxxbridge04$cxx_string$length"]
     fn string_length(_: &CxxString) -> usize;
 }
 
diff --git a/src/cxx_vector.rs b/src/cxx_vector.rs
index 10853a6..a7d3f2f 100644
--- a/src/cxx_vector.rs
+++ b/src/cxx_vector.rs
@@ -139,7 +139,7 @@
             fn __vector_size(v: &CxxVector<$ty>) -> usize {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$std$vector$", $segment, "$size")]
+                        #[link_name = concat!("cxxbridge04$std$vector$", $segment, "$size")]
                         fn __vector_size(_: &CxxVector<$ty>) -> usize;
                     }
                 }
@@ -148,7 +148,7 @@
             unsafe fn __get_unchecked(v: &CxxVector<$ty>, pos: usize) -> &$ty {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$std$vector$", $segment, "$get_unchecked")]
+                        #[link_name = concat!("cxxbridge04$std$vector$", $segment, "$get_unchecked")]
                         fn __get_unchecked(_: &CxxVector<$ty>, _: usize) -> *const $ty;
                     }
                 }
@@ -157,7 +157,7 @@
             fn __unique_ptr_null() -> *mut c_void {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$unique_ptr$std$vector$", $segment, "$null")]
+                        #[link_name = concat!("cxxbridge04$unique_ptr$std$vector$", $segment, "$null")]
                         fn __unique_ptr_null(this: *mut *mut c_void);
                     }
                 }
@@ -168,7 +168,7 @@
             unsafe fn __unique_ptr_raw(raw: *mut CxxVector<Self>) -> *mut c_void {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$unique_ptr$std$vector$", $segment, "$raw")]
+                        #[link_name = concat!("cxxbridge04$unique_ptr$std$vector$", $segment, "$raw")]
                         fn __unique_ptr_raw(this: *mut *mut c_void, raw: *mut CxxVector<$ty>);
                     }
                 }
@@ -179,7 +179,7 @@
             unsafe fn __unique_ptr_get(repr: *mut c_void) -> *const CxxVector<Self> {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$unique_ptr$std$vector$", $segment, "$get")]
+                        #[link_name = concat!("cxxbridge04$unique_ptr$std$vector$", $segment, "$get")]
                         fn __unique_ptr_get(this: *const *mut c_void) -> *const CxxVector<$ty>;
                     }
                 }
@@ -188,7 +188,7 @@
             unsafe fn __unique_ptr_release(mut repr: *mut c_void) -> *mut CxxVector<Self> {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$unique_ptr$std$vector$", $segment, "$release")]
+                        #[link_name = concat!("cxxbridge04$unique_ptr$std$vector$", $segment, "$release")]
                         fn __unique_ptr_release(this: *mut *mut c_void) -> *mut CxxVector<$ty>;
                     }
                 }
@@ -197,7 +197,7 @@
             unsafe fn __unique_ptr_drop(mut repr: *mut c_void) {
                 extern "C" {
                     attr! {
-                        #[link_name = concat!("cxxbridge03$unique_ptr$std$vector$", $segment, "$drop")]
+                        #[link_name = concat!("cxxbridge04$unique_ptr$std$vector$", $segment, "$drop")]
                         fn __unique_ptr_drop(this: *mut *mut c_void);
                     }
                 }
diff --git a/src/result.rs b/src/result.rs
index 0373bd8..72c4959 100644
--- a/src/result.rs
+++ b/src/result.rs
@@ -32,7 +32,7 @@
     let len = msg.len();
 
     extern "C" {
-        #[link_name = "cxxbridge03$error"]
+        #[link_name = "cxxbridge04$error"]
         fn error(ptr: *const u8, len: usize) -> *const u8;
     }
 
diff --git a/src/symbols/exception.rs b/src/symbols/exception.rs
index 849db3b..7484d1c 100644
--- a/src/symbols/exception.rs
+++ b/src/symbols/exception.rs
@@ -1,6 +1,6 @@
 use std::slice;
 
-#[export_name = "cxxbridge03$exception"]
+#[export_name = "cxxbridge04$exception"]
 unsafe extern "C" fn exception(ptr: *const u8, len: usize) -> *const u8 {
     let slice = slice::from_raw_parts(ptr, len);
     let boxed = String::from_utf8_lossy(slice).into_owned().into_boxed_str();
diff --git a/src/symbols/rust_str.rs b/src/symbols/rust_str.rs
index 6dc04ac..5111c6a 100644
--- a/src/symbols/rust_str.rs
+++ b/src/symbols/rust_str.rs
@@ -1,7 +1,7 @@
 use std::slice;
 use std::str;
 
-#[export_name = "cxxbridge03$str$valid"]
+#[export_name = "cxxbridge04$str$valid"]
 unsafe extern "C" fn str_valid(ptr: *const u8, len: usize) -> bool {
     let slice = slice::from_raw_parts(ptr, len);
     str::from_utf8(slice).is_ok()
diff --git a/src/symbols/rust_string.rs b/src/symbols/rust_string.rs
index d8e0f4a..94b2110 100644
--- a/src/symbols/rust_string.rs
+++ b/src/symbols/rust_string.rs
@@ -8,17 +8,17 @@
     repr: String,
 }
 
-#[export_name = "cxxbridge03$string$new"]
+#[export_name = "cxxbridge04$string$new"]
 unsafe extern "C" fn string_new(this: &mut MaybeUninit<String>) {
     ptr::write(this.as_mut_ptr(), String::new());
 }
 
-#[export_name = "cxxbridge03$string$clone"]
+#[export_name = "cxxbridge04$string$clone"]
 unsafe extern "C" fn string_clone(this: &mut MaybeUninit<String>, other: &String) {
     ptr::write(this.as_mut_ptr(), other.clone());
 }
 
-#[export_name = "cxxbridge03$string$from"]
+#[export_name = "cxxbridge04$string$from"]
 unsafe extern "C" fn string_from(
     this: &mut MaybeUninit<String>,
     ptr: *const u8,
@@ -34,17 +34,17 @@
     }
 }
 
-#[export_name = "cxxbridge03$string$drop"]
+#[export_name = "cxxbridge04$string$drop"]
 unsafe extern "C" fn string_drop(this: &mut ManuallyDrop<String>) {
     ManuallyDrop::drop(this);
 }
 
-#[export_name = "cxxbridge03$string$ptr"]
+#[export_name = "cxxbridge04$string$ptr"]
 unsafe extern "C" fn string_ptr(this: &String) -> *const u8 {
     this.as_ptr()
 }
 
-#[export_name = "cxxbridge03$string$len"]
+#[export_name = "cxxbridge04$string$len"]
 unsafe extern "C" fn string_len(this: &String) -> usize {
     this.len()
 }
diff --git a/src/symbols/rust_vec.rs b/src/symbols/rust_vec.rs
index 5465471..5081ec3 100644
--- a/src/symbols/rust_vec.rs
+++ b/src/symbols/rust_vec.rs
@@ -21,31 +21,31 @@
 
         const _: () = {
             attr! {
-                #[export_name = concat!("cxxbridge03$rust_vec$", $segment, "$new")]
+                #[export_name = concat!("cxxbridge04$rust_vec$", $segment, "$new")]
                 unsafe extern "C" fn __new(this: *mut RustVec<$ty>) {
                     ptr::write(this, RustVec { repr: Vec::new() });
                 }
             }
             attr! {
-                #[export_name = concat!("cxxbridge03$rust_vec$", $segment, "$drop")]
+                #[export_name = concat!("cxxbridge04$rust_vec$", $segment, "$drop")]
                 unsafe extern "C" fn __drop(this: *mut RustVec<$ty>) {
                     ptr::drop_in_place(this);
                 }
             }
             attr! {
-                #[export_name = concat!("cxxbridge03$rust_vec$", $segment, "$len")]
+                #[export_name = concat!("cxxbridge04$rust_vec$", $segment, "$len")]
                 unsafe extern "C" fn __len(this: *const RustVec<$ty>) -> usize {
                     (*this).repr.len()
                 }
             }
             attr! {
-                #[export_name = concat!("cxxbridge03$rust_vec$", $segment, "$data")]
+                #[export_name = concat!("cxxbridge04$rust_vec$", $segment, "$data")]
                 unsafe extern "C" fn __data(this: *const RustVec<$ty>) -> *const $ty {
                     (*this).repr.as_ptr()
                 }
             }
             attr! {
-                #[export_name = concat!("cxxbridge03$rust_vec$", $segment, "$stride")]
+                #[export_name = concat!("cxxbridge04$rust_vec$", $segment, "$stride")]
                 unsafe extern "C" fn __stride() -> usize {
                     mem::size_of::<$ty>()
                 }
diff --git a/src/unique_ptr.rs b/src/unique_ptr.rs
index 34a1f0e..0428b5f 100644
--- a/src/unique_ptr.rs
+++ b/src/unique_ptr.rs
@@ -174,15 +174,15 @@
 }
 
 extern "C" {
-    #[link_name = "cxxbridge03$unique_ptr$std$string$null"]
+    #[link_name = "cxxbridge04$unique_ptr$std$string$null"]
     fn unique_ptr_std_string_null(this: *mut *mut c_void);
-    #[link_name = "cxxbridge03$unique_ptr$std$string$raw"]
+    #[link_name = "cxxbridge04$unique_ptr$std$string$raw"]
     fn unique_ptr_std_string_raw(this: *mut *mut c_void, raw: *mut CxxString);
-    #[link_name = "cxxbridge03$unique_ptr$std$string$get"]
+    #[link_name = "cxxbridge04$unique_ptr$std$string$get"]
     fn unique_ptr_std_string_get(this: *const *mut c_void) -> *const CxxString;
-    #[link_name = "cxxbridge03$unique_ptr$std$string$release"]
+    #[link_name = "cxxbridge04$unique_ptr$std$string$release"]
     fn unique_ptr_std_string_release(this: *mut *mut c_void) -> *mut CxxString;
-    #[link_name = "cxxbridge03$unique_ptr$std$string$drop"]
+    #[link_name = "cxxbridge04$unique_ptr$std$string$drop"]
     fn unique_ptr_std_string_drop(this: *mut *mut c_void);
 }
 
diff --git a/syntax/mangle.rs b/syntax/mangle.rs
index c9392db..1c8c917 100644
--- a/syntax/mangle.rs
+++ b/syntax/mangle.rs
@@ -3,7 +3,7 @@
 use crate::syntax::ExternFn;
 use proc_macro2::Ident;
 
-const CXXBRIDGE: &str = "cxxbridge03";
+const CXXBRIDGE: &str = "cxxbridge04";
 
 macro_rules! join {
     ($($segment:expr),*) => {
diff --git a/syntax/symbol.rs b/syntax/symbol.rs
index 066d238..c8500b9 100644
--- a/syntax/symbol.rs
+++ b/syntax/symbol.rs
@@ -4,7 +4,7 @@
 use std::fmt::{self, Display, Write};
 
 // A mangled symbol consisting of segments separated by '$'.
-// For example: cxxbridge03$string$new
+// For example: cxxbridge04$string$new
 pub struct Symbol(String);
 
 impl Display for Symbol {