Lift parse.rs and lookahead.rs into syn
diff --git a/src/lib.rs b/src/lib.rs
index 793d256..9d90ab1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -577,6 +577,12 @@
 pub mod next;
 
 #[cfg(feature = "parsing")]
+mod lookahead;
+
+#[cfg(feature = "parsing")]
+pub mod parse;
+
+#[cfg(feature = "parsing")]
 #[macro_use]
 mod group;
 
@@ -590,7 +596,7 @@
 use proc_macro2::Span;
 
 #[cfg(feature = "parsing")]
-pub mod error;
+mod error;
 #[cfg(feature = "parsing")]
 use error::Error;