Merge pull request #83 from loloicci/fix-82

modify error message for assertion
loloicci · Mar 30, 2021 · b842cff · b842cff
2 parents 28a8297 + cdfa21d
commit b842cff
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diff --git a/src/nimly/lexgen.nim b/src/nimly/lexgen.nim
@@ -816,7 +816,7 @@ proc convertToSeqRePart(re: string): seq[RePart] =
         of 'd', 'D', 's', 'S', 'w', 'W':
           result.add(Tree(classTable[c].convertToTree))
         else:
-          doassert false, "Invalid escaping"
+          doassert false, "Invalid escaping \"\\" & c & "\" is in niml match pattern."
         flag.excl(readingEscape)
       else:
         case c

diff --git a/tests/ex.nim b/tests/ex.nim
@@ -0,0 +1,9 @@
+import nimly
+import patty
+
+variant Token:
+  FOO
+
+niml a[Token]:
+  r"\:":
+    return FOO()