fix: Support ?Q…@ productions

I *think* this is when you use a concrete class as an explicit interface,
similar to what `<Type as Trait>` is in Rust, though not quite sure.

src/lib.rs

@@ -257,6 +257,7 @@ pub enum VarStorageKind {
 pub enum Name<'a> {
     Operator(Operator<'a>),
     NonTemplate(&'a [u8]),
+    AsInterface(&'a [u8]),
     Template(Box<Name<'a>>, Params<'a>),
     Discriminator(i32),
     ParsedName(Box<ParseResult<'a>>),
@@ -271,6 +272,10 @@ impl<'a> fmt::Debug for Name<'a> {
                 .debug_tuple("NonTemplate")
                 .field(&String::from_utf8_lossy(s))
                 .finish(),
+            Name::AsInterface(s) => f
+                .debug_tuple("AsInterface")
+                .field(&String::from_utf8_lossy(s))
+                .finish(),
             Name::Template(ref name, ref params) => {
                 f.debug_tuple("Template").field(name).field(params).finish()
             }
@@ -875,6 +880,12 @@ impl<'a> ParserState<'a> {
                             self.memorize_name(&name);
                         }
                         name
+                    } else if self.consume(b"Q") {
+                        let name = self.read_string()?;
+                        self.expect(b"@")?;
+                        let name = Name::AsInterface(name);
+                        self.memorize_name(&name);
+                        name
                     } else {
                         let discriminator = self.read_number()?;
                         Name::Discriminator(discriminator)
@@ -2176,6 +2187,11 @@ impl<'a> Serializer<'a> {
             Name::NonTemplate(ref name) => {
                 self.w.write_all(name)?;
             }
+            Name::AsInterface(ref name) => {
+                write!(self.w, "[")?;
+                self.w.write_all(name)?;
+                write!(self.w, "]")?;
+            }
             Name::Template(ref name, ref params) => {
                 self.write_one_name(name)?;
                 self.write_tmpl_params(&params)?;
@@ -2273,6 +2289,11 @@ impl<'a> Serializer<'a> {
             Name::NonTemplate(ref name) => {
                 self.w.write_all(name)?;
             }
+            Name::AsInterface(ref name) => {
+                write!(self.w, "[")?;
+                self.w.write_all(name)?;
+                write!(self.w, "]")?;
+            }
             Name::Template(ref name, ref params) => {
                 self.write_one_name(name)?;
                 self.write_tmpl_params(&params)?;

tests/test_basics.rs

@@ -181,6 +181,11 @@ fn other_tests() {
         "?getFactory@SkImageShader@@UBEP6A?AV?$sk_sp@VSkFlattenable@@@@AAVSkReadBuffer@@@ZXZ",
         "public: virtual class sk_sp<class SkFlattenable> (__cdecl * __thiscall SkImageShader::getFactory(void) const)(class SkReadBuffer &)"
     );
+
+    expect(
+        "?Present1@?QIDXGISwapChain4@@CDXGISwapChain@@UAGJIIPBUDXGI_PRESENT_PARAMETERS@@@Z", 
+        "public: virtual long __stdcall CDXGISwapChain::[IDXGISwapChain4]::Present1(unsigned int,unsigned int,struct DXGI_PRESENT_PARAMETERS const *)"
+    );
 }
 
 #[test]