From a443f0a1a4b79faa0b0271b72ea4a8e5f3d03ffd Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Sat, 14 May 2022 14:42:00 +0900
Subject: Prohibit applying the expansion operator to anything other than
 identifiers

---
 spec/parser_test.go | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'spec/parser_test.go')

diff --git a/spec/parser_test.go b/spec/parser_test.go
index 15f1330..c7d43de 100644
--- a/spec/parser_test.go
+++ b/spec/parser_test.go
@@ -598,6 +598,60 @@ bar: "bar";
 				},
 			},
 		},
+		{
+			caption: "an expansion operator must be preceded by an identifier",
+			src: `
+s
+    : foo #ast ...
+    ;
+`,
+			synErr: synErrStrayExpOp,
+		},
+		{
+			caption: "an expansion operator must be preceded by an identifier",
+			src: `
+a
+    : foo #ast ... foo
+    ;
+`,
+			synErr: synErrStrayExpOp,
+		},
+		{
+			caption: "an expansion operator cannot be applied to a pattern",
+			src: `
+a
+    : "foo" #ast "foo"...
+    ;
+`,
+			synErr: synErrInvalidExpOperand,
+		},
+		{
+			caption: "an expansion operator cannot be applied to a string",
+			src: `
+a
+    : 'foo' #ast 'foo'...
+    ;
+`,
+			synErr: synErrInvalidExpOperand,
+		},
+		{
+			caption: "an expansion operator cannot be applied to an ordered symbol",
+			src: `
+a
+    : foo #ast $foo...
+    ;
+`,
+			synErr: synErrInvalidExpOperand,
+		},
+		{
+			caption: "an expansion operator cannot be applied to a directive group",
+			src: `
+a
+    : foo #ast ()...
+    ;
+`,
+			synErr: synErrInvalidExpOperand,
+		},
 		{
 			caption: "an AST has node positions",
 			src: `
-- 
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