Fix panic for typdef void (#65)

* get rid of panic for typedef void (interprets as typedef struct {} )

.gitignore

@@ -3,4 +3,5 @@
 /.testdata*/
 /.examples/
 .idea/
-/dist/
+/dist/
+.vscode/

convert.go

@@ -496,6 +496,9 @@ func (g *translator) convertDecl(d *cc.Declaration) []CDecl {
 			dname := dd.Name().String()
 			conf := g.idents[dname]
 			vt := g.convertTypeRootOpt(conf, dd.Type(), id.Position())
+			if isTypedef && vt == nil {
+				vt = types.StructT(nil)
+			}
 			var init Expr
 			if id.Initializer != nil && inCur {
 				if isTypedef {

docs/quirks.md

@@ -57,4 +57,20 @@ To solve this, `cxgo` emulates a virtual include file system at `/_cxgo_override
 headers bundled into `cxgo`.
 
 It serves two purposes: provides a zero-config experience for common use cases and allows `cxgo` to implement C stdlib
-differently and adapt it to the needs of Go.
+differently and adapt it to the needs of Go.
+
+### typedef void
+
+Example from struct_FILE.h:
+
+    typedef void _IO_lock_t;
+
+    _IO_lock_t *_lock;
+
+For now `cxgo` interprets it as 
+
+    typedef struct{} _IO_lock_t;
+
+
+
+