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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2016-02-18 11:05:45 +0000 |
|---|---|---|
| committer | Simon Peyton Jones <simonpj@microsoft.com> | 2016-02-18 11:35:06 +0000 |
| commit | 01449eb552daa082e46ceaaf8481708ee73dc2ad (patch) | |
| tree | e23a374134e33784f1707859190264b702ae0ad6 /testsuite/tests/deSugar/should_run | |
| parent | 27842ec190cf46b6e494520761af41847837dc86 (diff) | |
| download | haskell-01449eb552daa082e46ceaaf8481708ee73dc2ad.tar.gz | |
Fix desugaring of bang-pattern let-bindings
When implementing Strict Haskell, the patch 46a03fbe didn't faithfully
implement the semantics given in the manual. In particular there was
an ad-hoc case in mkSelectorBinds for "strict and no binders" that
didn't work.
This patch fixes it, curing Trac #11572.
Howver it forced me to think about banged let-bindings, and I rather
think we do not have quite the right semantics yet, so I've opened
Trac #11601.
Diffstat (limited to 'testsuite/tests/deSugar/should_run')
| -rw-r--r-- | testsuite/tests/deSugar/should_run/T11572.hs | 6 | ||||
| -rw-r--r-- | testsuite/tests/deSugar/should_run/T11572.stderr | 4 | ||||
| -rw-r--r-- | testsuite/tests/deSugar/should_run/all.T | 1 |
3 files changed, 11 insertions, 0 deletions
diff --git a/testsuite/tests/deSugar/should_run/T11572.hs b/testsuite/tests/deSugar/should_run/T11572.hs new file mode 100644 index 0000000000..4972241e5b --- /dev/null +++ b/testsuite/tests/deSugar/should_run/T11572.hs @@ -0,0 +1,6 @@ +{-# LANGUAGE BangPatterns #-} + +module Main where + +main :: IO () +main = let !_ = (undefined :: ()) in print 2 diff --git a/testsuite/tests/deSugar/should_run/T11572.stderr b/testsuite/tests/deSugar/should_run/T11572.stderr new file mode 100644 index 0000000000..b1136024db --- /dev/null +++ b/testsuite/tests/deSugar/should_run/T11572.stderr @@ -0,0 +1,4 @@ +T11572: Prelude.undefined +CallStack (from HasCallStack): + error, called at libraries/base/GHC/Err.hs:79:14 in base:GHC.Err + undefined, called at T11572.hs:6:18 in main:Main diff --git a/testsuite/tests/deSugar/should_run/all.T b/testsuite/tests/deSugar/should_run/all.T index 6bd054286b..265580ab0d 100644 --- a/testsuite/tests/deSugar/should_run/all.T +++ b/testsuite/tests/deSugar/should_run/all.T @@ -50,3 +50,4 @@ test('DsStrictData', normal, compile_and_run, ['']) test('DsStrict', normal, compile_and_run, ['']) test('DsStrictLet', normal, compile_and_run, ['-O']) test('T11193', exit_code(1), compile_and_run, ['']) +test('T11572', exit_code(1), compile_and_run, ['']) |