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| -rw-r--r-- | CONTRIBUTING.md | 4 |
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 1145dd835..11a0c9c94 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -205,6 +205,10 @@ placed in the source directory): Profiling --------- +To diagnose a performance issue with parsing, first try using +the `--trace` option. This will give you a record of when block +parsers succeed, so you can spot backtracking issues. + To use the GHC profiler with cabal: cabal clean |