wit: change the ABI alignment of list<T> from 8 to 4

Fixes #288.

Author: ydnar

wit/list.go

@@ -17,7 +17,7 @@ func (*List) Size() uintptr { return 8 } // [2]int32
 // Align returns the [ABI byte alignment] a [List].
 //
 // [ABI byte alignment]: https://github.com/WebAssembly/component-model/blob/main/design/mvp/CanonicalABI.md#alignment
-func (*List) Align() uintptr { return 8 } // [2]int32
+func (*List) Align() uintptr { return 4 }
 
 // Flat returns the [flattened] ABI representation of [List].
 //

wit/list_test.go

@@ -0,0 +1,12 @@
+package wit
+
+import "testing"
+
+// https://github.com/bytecodealliance/go-modules/issues/288
+func TestListAlign(t *testing.T) {
+	var l List
+	got, want := l.Align(), uintptr(4)
+	if got != want {
+		t.Errorf("ABI alignment for list<T> is %d, expected %d", got, want)
+	}
+}