Make failure more production friendly

Reviewed By: ericlippert Differential Revision: D6189346 fbshipit-source-id: e5562df165845c424df6a76a2ce1c18634d42b6e
facebook · Oct 31, 2017 · bccc51d · bccc51d
1 parent 03fb4e6
commit bccc51d
Showing 1 changed file with 2 additions and 4 deletions.
diff --git a/hphp/hack/src/parser/full_fidelity_lexer.ml b/hphp/hack/src/parser/full_fidelity_lexer.ml
@@ -1404,10 +1404,8 @@ let scan_assert_progress tokenizer lexer  =
     (Token.kind token) = TokenKind.EndOfFile) then
       (lexer, token)
   else begin
-    let message = Printf.sprintf
-      "failed to make progress at %d\n" (offset lexer) in
-    print_endline message;
-    assert false
+    Printf.kprintf failwith
+      "failed to make progress at %d\n" (offset lexer)
   end
 
 let scan_next_token as_name scanner lexer =