Implement PartialEq on FuncType.

crates/api/src/types.rs

@@ -168,7 +168,7 @@ fn from_wasmtime_abiparam(param: &ir::AbiParam) -> Option<ValType> {
 /// A descriptor for a function in a WebAssembly module.
 ///
 /// WebAssembly functions can have 0 or more parameters and results.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct FuncType {
     params: Box<[ValType]>,
     results: Box<[ValType]>,

crates/c-api/src/wasi.rs

@@ -244,11 +244,7 @@ pub unsafe extern "C" fn wasi_instance_bind_import(
 
     match (*instance).wasi.get_export(name) {
         Some(export) => {
-            if export.ty().params() != func_type.params() {
-                return std::ptr::null_mut();
-            }
-
-            if export.ty().results() != func_type.results() {
+            if export.ty() != func_type {
                 return std::ptr::null_mut();
             }