}
	case *ast.TypeAssertExpr:
		f.walk(&n.X, ctxExpr, visit)
		f.walk(&n.Type, ctxType, visit)
	case *ast.CallExpr:
		if context == ctxAssign2 {
			f.walk(&n.Fun, ctxCall2, visit)
		} else {
			f.walk(&n.Fun, ctxCall, visit)
		}
		f.walk(n.Args, ctxExpr, visit)
	case *ast.StarExpr:
		f.walk(&n.X, context, visit)
	case *ast.UnaryExpr:
		f.walk(&n.X, ctxExpr, visit)
	case *ast.BinaryExpr:

	// This is a call to C.xxx; set goname to "xxx".
	// It may have already been mangled by rewriteName.
	var goname string
	switch fun := call.Call.Fun.(type) {
	case *ast.SelectorExpr:
		goname = fun.Sel.Name
	case *ast.Ident:
		goname = strings.TrimPrefix(fun.Name, "_C2func_")
		goname = strings.TrimPrefix(goname, "_Cfunc_")
	}
	if goname == "" || goname == "malloc" {
		return "", false
	}

pkg go/ast, const Con ObjKind
pkg go/ast, const FilterFuncDuplicates MergeMode
pkg go/ast, const FilterImportDuplicates MergeMode
pkg go/ast, const FilterUnassociatedComments MergeMode
pkg go/ast, const Fun ObjKind
pkg go/ast, const Lbl ObjKind
pkg go/ast, const Pkg ObjKind
pkg go/ast, const RECV ChanDir
pkg go/ast, const SEND ChanDir
pkg go/ast, const Typ ObjKind
pkg go/ast, const Var ObjKind

pkg go/ast, const Bad = 0
pkg go/ast, const Con = 2
pkg go/ast, const FilterFuncDuplicates = 1
pkg go/ast, const FilterImportDuplicates = 4
pkg go/ast, const FilterUnassociatedComments = 2
pkg go/ast, const Fun = 5
pkg go/ast, const Lbl = 6
pkg go/ast, const Pkg = 1
pkg go/ast, const RECV = 2
pkg go/ast, const SEND = 1
pkg go/ast, const Typ = 3
pkg go/ast, const Var = 4