Macro call can contain char literal (#76)

* Macro call can contain char literal

* Don't break lifetime in macros

Author: calixteman

corpus/macros.txt

@@ -25,6 +25,9 @@ a!(* a *);
 a!(& a &);
 a!(- a -);
 a!(b + c + +);
+a!('a'..='z');
+a!('\u{0}'..='\u{2}');
+a!('lifetime)
 
 ----
 
@@ -40,7 +43,16 @@ a!(b + c + +);
     (token_tree (identifier)))
   (macro_invocation
     (identifier)
-    (token_tree (identifier) (identifier))))
+    (token_tree (identifier) (identifier)))
+  (macro_invocation
+    (identifier)
+    (token_tree (char_literal) (char_literal)))
+  (macro_invocation
+    (identifier)
+    (token_tree (char_literal) (char_literal)))
+  (macro_invocation
+    (identifier)
+    (token_tree (identifier))))
 
 ============================================
 Macro definition

grammar.js

@@ -190,7 +190,8 @@ module.exports = grammar({
     _non_special_token: $ => choice(
       $._literal, $.identifier, $.metavariable, $.mutable_specifier, $.self, $.super, $.crate,
       alias(choice(...primitive_types), $.primitive_type),
-      /[/_\-=->,;:::!=?.@*=/='&=#%=^=+<>|~]+/,
+      /[/_\-=->,;:::!=?.@*=/=&=#%=^=+<>|~]+/,
+      '\'',
       'as', 'async', 'await', 'break', 'const', 'continue', 'default', 'enum', 'fn', 'for', 'if', 'impl',
       'let', 'loop', 'match', 'mod', 'pub', 'return', 'static', 'struct', 'trait', 'type',
       'union', 'unsafe', 'use', 'where', 'while'

src/grammar.json

@@ -755,7 +755,11 @@
         },
         {
           "type": "PATTERN",
-          "value": "[\\/_\\-=->,;:::!=?.@*=\\/='&=#%=^=+<>|~]+"
+          "value": "[\\/_\\-=->,;:::!=?.@*=\\/=&=#%=^=+<>|~]+"
+        },
+        {
+          "type": "STRING",
+          "value": "'"
         },
         {
           "type": "STRING",