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Mention flags necessary, instead of -O authored by thomie's avatar thomie
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...@@ -194,7 +194,9 @@ Let us have a closer look at the stack: ...@@ -194,7 +194,9 @@ Let us have a closer look at the stack:
function. That the stack is so "clean" means that we have no lazy function. That the stack is so "clean" means that we have no lazy
evaluation going on, which is a result of compiling evaluation going on, which is a result of compiling
with optimisations above (`-O`). Perhaps unintuitively, simple with optimisations above (`-O`). Perhaps unintuitively, simple
optimisations often improve stack trace clarity. optimisations often improve stack trace clarity (the following flags,
all part of `-O`, seem particularly helpful:
`-fno-ignore-interface-pragmas -fno-omit-interface-pragmas -fenable-rewrite-rules`).
- On the other hand, `main` does not appear in the stack any more. In - On the other hand, `main` does not appear in the stack any more. In
fact, where it should be we only see `show` and `putStrLn` fact, where it should be we only see `show` and `putStrLn`
... ...
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