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| author | Magnus Lång <[email protected]> | 2016-02-28 00:17:48 +0100 |
|---|---|---|
| committer | Hans Bolinder <[email protected]> | 2016-04-28 16:16:09 +0200 |
| commit | ebd967522612333e52a884181e6132b1ba7e5239 (patch) | |
| tree | cd12d37cd4fe9d375cf15acbad8d08e5a4542af5 /lib/dialyzer/test/map_SUITE_data/src | |
| parent | e3ac51b173585f84c397ae38c27d772be2d308c6 (diff) | |
| download | otp-ebd967522612333e52a884181e6132b1ba7e5239.tar.gz otp-ebd967522612333e52a884181e6132b1ba7e5239.tar.bz2 otp-ebd967522612333e52a884181e6132b1ba7e5239.zip | |
dialyzer: Unfold cerl patterns containing maps
Dialyzer relies heavily on the assumption that the type of a literal
that is used as a pattern is the type of any value that can match that
pattern. For maps, that is not true, and it was causing bad analysis
results. A new help function dialyzer_utils:refold_pattern/1 identifies
maps in literal patterns, and unfolds and labels them, allowing them to
be properly analysed.
Diffstat (limited to 'lib/dialyzer/test/map_SUITE_data/src')
| -rw-r--r-- | lib/dialyzer/test/map_SUITE_data/src/bug.erl | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/dialyzer/test/map_SUITE_data/src/bug.erl b/lib/dialyzer/test/map_SUITE_data/src/bug.erl new file mode 100644 index 0000000000..9e152bf461 --- /dev/null +++ b/lib/dialyzer/test/map_SUITE_data/src/bug.erl @@ -0,0 +1,14 @@ +-module(bug). + +-export([t1/0, f1/1]). + +t1() -> + V = f1(#{a=>b}), + case V of + #{a := Q} -> Q; %% Must not warn here + _ -> ok + end, + ok. + +f1(M) -> %% Should get map() succ typing + #{} = M. |