From 151a856bf2f044f5e412646e3a9a22d69773b9d7 Mon Sep 17 00:00:00 2001
From: Nicholas Wiersma <nick@wiersma.co.za>
Date: Wed, 3 Jun 2020 09:44:03 +0200
Subject: [PATCH] fix: composite literal child types for call expressions

---
 _test/composite10.go | 14 ++++++++++++++
 _test/composite9.go  | 14 ++++++++++++++
 interp/cfg.go        |  4 ++++
 3 files changed, 32 insertions(+)
 create mode 100644 _test/composite10.go
 create mode 100644 _test/composite9.go

diff --git a/_test/composite10.go b/_test/composite10.go
new file mode 100644
index 00000000..9b52706a
--- /dev/null
+++ b/_test/composite10.go
@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := []map[int]int{make(map[int]int)}
+
+	for _, b := range a {
+		fmt.Println(b)
+	}
+}
+
+// Output:
+// map[]
diff --git a/_test/composite9.go b/_test/composite9.go
new file mode 100644
index 00000000..83efa882
--- /dev/null
+++ b/_test/composite9.go
@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := [][]int{make([]int,0)}
+
+	for _, b := range a {
+		fmt.Println(b)
+	}
+}
+
+// Output:
+// []
diff --git a/interp/cfg.go b/interp/cfg.go
index 7b863132..b792dfac 100644
--- a/interp/cfg.go
+++ b/interp/cfg.go
@@ -248,6 +248,10 @@ func (interp *Interpreter) cfg(root *node, pkgID string) ([]*node, error) {
 				case binaryExpr, unaryExpr:
 					// Do not attempt to propagate composite type to operator expressions,
 					// it breaks constant folding.
+				case callExpr:
+					if c.typ, err = nodeType(interp, sc, c); err != nil {
+						return false
+					}
 				default:
 					c.typ = n.typ
 				}