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-rw-r--r--grammar/semantic_error.go2
1 files changed, 2 insertions, 0 deletions
diff --git a/grammar/semantic_error.go b/grammar/semantic_error.go
index d540c03..4326d81 100644
--- a/grammar/semantic_error.go
+++ b/grammar/semantic_error.go
@@ -27,6 +27,8 @@ var (
semErrDuplicateTerminal = newSemanticError("duplicate terminal")
semErrDuplicateName = newSemanticError("duplicate names are not allowed between terminals and non-terminals")
semErrErrSymIsReserved = newSemanticError("symbol 'error' is reserved as a terminal symbol")
+ semErrDuplicateLabel = newSemanticError("a label must be unique in an alternative")
+ semErrInvalidLabel = newSemanticError("a label must differ from terminal symbols or non-terminal symbols")
semErrDirInvalidName = newSemanticError("invalid directive name")
semErrDirInvalidParam = newSemanticError("invalid parameter")
)