compiler: fix variadic args not being nil when zero length.

myitcv · flimzy · commit 88b99aa1d0a4 · 2021-12-27T15:38:36.000+01:00
Fixes #806.
diff --git a/compiler/utils.go b/compiler/utils.go
@@ -115,6 +115,10 @@ func (fc *funcContext) translateArgs(sig *types.Signature, argExprs []ast.Expr,
 
 	sigTypes := signatureTypes{Sig: sig}
 
+	if sig.Variadic() && len(argExprs) == 0 {
+		return []string{fmt.Sprintf("%s.nil", c.typeName(varargType))}
+	}
+
 	preserveOrder := false
 	for i := 1; i < len(argExprs); i++ {
 		preserveOrder = preserveOrder || fc.Blocking[argExprs[i]]
diff --git a/tests/compiler_test.go b/tests/compiler_test.go
@@ -0,0 +1,17 @@
+// +build js
+
+package tests
+
+import (
+	"testing"
+)
+
+func TestVariadicNil(t *testing.T) {
+	printVari := func(strs ...string) []string {
+		return strs
+	}
+
+	if v := printVari(); v != nil {
+		t.Errorf("expected printVari() to be %v; got: %v", nil, v)
+	}
+}
