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| author | Alec Theriault <alec.theriault@gmail.com> | 2018-12-03 07:03:44 -0500 |
|---|---|---|
| committer | Ryan Scott <ryan.gl.scott@gmail.com> | 2018-12-03 07:03:44 -0500 |
| commit | 75a8349b2a7d0142d3d687837caf5a95bbb4368d (patch) | |
| tree | 7a1c14b1ba4357dcc032d2d32a10039b8c3f1cd0 /libraries/base/GHC/Enum.hs | |
| parent | 93a3f9070d5d69ad6a28fe94ccccd20c54609698 (diff) | |
| download | haskell-75a8349b2a7d0142d3d687837caf5a95bbb4368d.tar.gz | |
Warn on all out-of-range literals in pats/exprs
Summary:
These changes were motivated by #13256. While poking around, I
realized we weren't very consistent in our "-Woverflowed-literals"
warnings. This patch fixes that by:
* warning earlier on in the pipeline (ie. before we've desugared
'Int' patterns into 'I# Int#')
* handling 'HsLit' as well as 'HsOverLit' (this covers unboxed
literals)
* covering more pattern / expression forms
4/6 of the warnings in the 'Overflow' test are due to this patch. The
other two are mostly for completeness.
Also fixed a missing empty-enumeration warning for 'Natural'.
This warnings were tripped up by the 'Bounded Word' instance (see #9505),
but the fix was obvious and simple: use unboxed word literals.
Test Plan: make TEST=Overflow && make TEST=T10930
Reviewers: hvr, bgamari, RyanGlScott
Reviewed By: RyanGlScott
Subscribers: RyanGlScott, rwbarton, carter
GHC Trac Issues: #13256, #10930
Differential Revision: https://phabricator.haskell.org/D5181
Diffstat (limited to 'libraries/base/GHC/Enum.hs')
| -rw-r--r-- | libraries/base/GHC/Enum.hs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libraries/base/GHC/Enum.hs b/libraries/base/GHC/Enum.hs index af74f7c984..1b64eaf668 100644 --- a/libraries/base/GHC/Enum.hs +++ b/libraries/base/GHC/Enum.hs @@ -632,9 +632,9 @@ instance Bounded Word where -- use unboxed literals for maxBound, because GHC doesn't optimise -- (fromInteger 0xffffffff :: Word). #if WORD_SIZE_IN_BITS == 32 - maxBound = W# (int2Word# 0xFFFFFFFF#) + maxBound = W# 0xFFFFFFFF## #elif WORD_SIZE_IN_BITS == 64 - maxBound = W# (int2Word# 0xFFFFFFFFFFFFFFFF#) + maxBound = W# 0xFFFFFFFFFFFFFFFF## #else #error Unhandled value for WORD_SIZE_IN_BITS #endif |