Allow using 'static lifetimes in functions

CHANGELOG.md

@@ -14,6 +14,11 @@
 * Add `TryFrom` implementations for `Number`, that allow losslessly converting from 64- and 128-bits numbers.
   [#3847](https://github.com/rustwasm/wasm-bindgen/pull/3847)
 
+### Changed
+
+* Allow using `'static` lifetimes in functions marked with `#[wasm_bindgen]`.
+  [#3856](https://github.com/rustwasm/wasm-bindgen/pull/3856)
+
 ### Fixed
 
 * Make .wasm output deterministic when using `--reference-types`.

crates/macro-support/src/parser.rs

@@ -1652,12 +1652,14 @@ fn assert_no_lifetimes(sig: &syn::Signature) -> Result<(), Diagnostic> {
     }
 
     impl<'ast> syn::visit::Visit<'ast> for Walk {
-        fn visit_lifetime(&mut self, i: &'ast syn::Lifetime) {
-            self.diagnostics.push(err_span!(
-                i,
-                "it is currently not sound to use lifetimes in function \
+        fn visit_lifetime(&mut self, lifetime: &'ast syn::Lifetime) {
+            if lifetime.ident != "static" {
+                self.diagnostics.push(err_span!(
+                    lifetime,
+                    "it is currently not sound to use lifetimes in function \
                  signatures"
-            ));
+                ));
+            }
         }
     }
     let mut walk = Walk {

crates/macro/ui-tests/invalid-imports.rs

@@ -36,6 +36,8 @@ extern "C" {
     fn f() -> Result<>;
     #[wasm_bindgen(catch)]
     fn f() -> Result<'a>;
+    #[wasm_bindgen(catch)]
+    fn f() -> Result<&'static u32>;
 }
 
 fn main() {}