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-rw-r--r--Util/VS2010/Dafny/DafnyLanguageService/Grammar.cs1
1 files changed, 1 insertions, 0 deletions
diff --git a/Util/VS2010/Dafny/DafnyLanguageService/Grammar.cs b/Util/VS2010/Dafny/DafnyLanguageService/Grammar.cs
index 0cd95bbd..df0f22ee 100644
--- a/Util/VS2010/Dafny/DafnyLanguageService/Grammar.cs
+++ b/Util/VS2010/Dafny/DafnyLanguageService/Grammar.cs
@@ -352,6 +352,7 @@ namespace Demo
| "==>"
| "<==>"
| "#"
+ | "?" // this is not an operator, but a possible character in identifiers
| n
| stringLiteral
;