Allow mutating signature through ExternFn
diff --git a/syntax/impls.rs b/syntax/impls.rs
index acc99ab..a2ce05b 100644
--- a/syntax/impls.rs
+++ b/syntax/impls.rs
@@ -1,7 +1,7 @@
use crate::syntax::{ExternFn, Receiver, Ref, Signature, Slice, Ty1, Type};
use std::hash::{Hash, Hasher};
use std::mem;
-use std::ops::Deref;
+use std::ops::{Deref, DerefMut};
impl Deref for ExternFn {
type Target = Signature;
@@ -11,6 +11,12 @@
}
}
+impl DerefMut for ExternFn {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ &mut self.sig
+ }
+}
+
impl Hash for Type {
fn hash<H: Hasher>(&self, state: &mut H) {
mem::discriminant(self).hash(state);