Fix the resolution for the core module (#4606)

Author: Spxg

CHANGELOG.md

@@ -67,6 +67,9 @@
 * Fix running coverage with no_modules.
   [#4604](https://github.com/wasm-bindgen/wasm-bindgen/pull/4604)
 
+* Fix proc-macro hygiene with `core`.
+  [#4606](https://github.com/wasm-bindgen/wasm-bindgen/pull/4606)
+
 --------------------------------------------------------------------------------
 
 ## [0.2.100](https://github.com/wasm-bindgen/wasm-bindgen/compare/0.2.99...0.2.100)

crates/backend/src/codegen.rs

@@ -1168,7 +1168,7 @@ impl ToTokens for ast::ImportType {
         if !no_deref {
             (quote! {
                 #[automatically_derived]
-                impl core::ops::Deref for #rust_name {
+                impl #wasm_bindgen::__rt::core::ops::Deref for #rust_name {
                     type Target = #internal_obj;
 
                     #[inline]

tests/resolve_core_module.rs

@@ -0,0 +1,6 @@
+mod core {}
+
+#[wasm_bindgen_macro::wasm_bindgen]
+extern "C" {
+    type Foo;
+}