hclwrite: No spaces before ... marker in argument lists or for exprs

hclwrite/format.go

@@ -248,8 +248,8 @@ func spaceAfterToken(subject, before, after *Token) bool {
 		// Don't use spaces around attribute access dots
 		return false
 
-	case after.Type == hclsyntax.TokenComma:
-		// No space right before a comma in an argument list
+	case after.Type == hclsyntax.TokenComma || after.Type == hclsyntax.TokenEllipsis:
+		// No space right before a comma or ... in an argument list
 		return false
 
 	case subject.Type == hclsyntax.TokenComma:

hclwrite/format_test.go

@@ -63,6 +63,10 @@ func TestFormat(t *testing.T) {
 			`foo(1, -2,a*b, b,c)`,
 			`foo(1, -2, a * b, b, c)`,
 		},
+		{
+			`foo(a,b...)`,
+			`foo(a, b...)`,
+		},
 		{
 			`a="hello ${ name }"`,
 			`a = "hello ${name}"`,