6 files changed, 26 insertions, 1 deletions
diff --git a/pkg/ast/ast.go b/pkg/ast/ast.go
index f1f74e61b..8cd7bef6e 100644
--- a/pkg/ast/ast.go
+++ b/pkg/ast/ast.go
@@ -92,6 +92,7 @@ type Call struct {
 	NR       uint64
 	Args     []*Field
 	Ret      *Type
+	Attrs    []*Type
 }
 
 func (n *Call) Info() (Pos, string, string) {
diff --git a/pkg/ast/clone.go b/pkg/ast/clone.go
index 54bf8250c..ece4ba594 100644
--- a/pkg/ast/clone.go
+++ b/pkg/ast/clone.go
@@ -89,6 +89,7 @@ func (n *Call) Clone() Node {
 		NR:       n.NR,
 		Args:     cloneFields(n.Args),
 		Ret:      ret,
+		Attrs:    cloneTypes(n.Attrs),
 	}
 }
 
diff --git a/pkg/ast/format.go b/pkg/ast/format.go
index a2ead06f2..422478e97 100644
--- a/pkg/ast/format.go
+++ b/pkg/ast/format.go
@@ -112,6 +112,13 @@ func (c *Call) serialize(w io.Writer) {
 	if c.Ret != nil {
 		fmt.Fprintf(w, " %v", fmtType(c.Ret))
 	}
+	if len(c.Attrs) != 0 {
+		fmt.Fprintf(w, " (")
+		for i, t := range c.Attrs {
+			fmt.Fprintf(w, "%v%v", comma(i, ""), fmtType(t))
+		}
+		fmt.Fprintf(w, ")")
+	}
 	fmt.Fprintf(w, "\n")
 }
 
diff --git a/pkg/ast/parser.go b/pkg/ast/parser.go
index 7b46f6611..3f3feda9e 100644
--- a/pkg/ast/parser.go
+++ b/pkg/ast/parser.go
@@ -295,9 +295,16 @@ func (p *parser) parseCall(name *Ident) *Call {
 		p.tryConsume(tokComma)
 	}
 	p.consume(tokRParen)
-	if p.tok != tokNewLine {
+	if p.tok != tokNewLine && p.tok != tokLParen {
 		c.Ret = p.parseType()
 	}
+	if p.tryConsume(tokLParen) {
+		c.Attrs = append(c.Attrs, p.parseType())
+		for p.tryConsume(tokComma) {
+			c.Attrs = append(c.Attrs, p.parseType())
+		}
+		p.consume(tokRParen)
+	}
 	return c
 }
 
diff --git a/pkg/ast/testdata/all.txt b/pkg/ast/testdata/all.txt
index 122fa514b..eccdda712 100644
--- a/pkg/ast/testdata/all.txt
+++ b/pkg/ast/testdata/all.txt
@@ -23,6 +23,12 @@ str_flags4 = "string", 42		### unexpected int, expecting string, hex string
 call(foo ,int32 , bar int32)		### unexpected ',', expecting int, identifier, string
 call(foo int32:"bar")			### unexpected string, expecting int, identifier
 call(a int32, b len[a:"bar"])		### unexpected string, expecting int, identifier
+call() (attr)
+call() (attr1, attr2[arg1, "arg2"])
+call() ("attr1")
+call() (42)
+call() (				### unexpected '\n', expecting int, identifier, string
+call() ()				### unexpected ')', expecting int, identifier, string
 
 define FOO bar
 
diff --git a/pkg/ast/walk.go b/pkg/ast/walk.go
index 142befaaf..fe64b0676 100644
--- a/pkg/ast/walk.go
+++ b/pkg/ast/walk.go
@@ -77,6 +77,9 @@ func (n *Call) walk(cb func(Node)) {
 	if n.Ret != nil {
 		cb(n.Ret)
 	}
+	for _, a := range n.Attrs {
+		cb(a)
+	}
 }
 
 func (n *Struct) walk(cb func(Node)) {