From 7bf1481e25ea09b0f49da981f868403c56f45092 Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@ucc.asn.au>
Date: Sat, 30 Dec 2017 15:18:17 +0800
Subject: macro_rules - Fix a few edge cases

---
 src/macro_rules/parse.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/macro_rules/parse.cpp')

diff --git a/src/macro_rules/parse.cpp b/src/macro_rules/parse.cpp
index f5b0f0e4..b3b1014e 100644
--- a/src/macro_rules/parse.cpp
+++ b/src/macro_rules/parse.cpp
@@ -212,7 +212,10 @@ public:
                     // TODO: `error-chain`'s quick_error macro has an arm which refers to an undefined metavar.
                     // - Maybe emit a warning and use a marker index.
                     WARNING(lex.point_span(), W0000, "Macro variable $" << name << " not found");
-                    idx = (1<<16)-1;    // NOTE: Encoded as a u16
+                    // Emit the literal $ <name>
+                    ret.push_back( MacroExpansionEnt(Token(TOK_DOLLAR)) );
+                    ret.push_back( MacroExpansionEnt(mv$(tok)) );
+                    continue ;
                 }
                 if( var_set_ptr ) {
                     var_set_ptr->insert( ::std::make_pair(idx,true) );
-- 
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