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author | Magnus Lång <[email protected]> | 2016-04-18 19:01:54 +0200 |
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committer | Hans Bolinder <[email protected]> | 2016-04-28 16:16:10 +0200 |
commit | 81234c978d1ff1295d20158ed83b296b1f5b1c9f (patch) | |
tree | 8cc1e9d6c608f76aa5b3330d410c9c483aedb78f /make | |
parent | 80bda0beb9c45a016414009d3a84c502301bece8 (diff) | |
download | otp-81234c978d1ff1295d20158ed83b296b1f5b1c9f.tar.gz otp-81234c978d1ff1295d20158ed83b296b1f5b1c9f.tar.bz2 otp-81234c978d1ff1295d20158ed83b296b1f5b1c9f.zip |
dialyzer: Fix another pattern literal bug
dialyzer_typesig:traverse/3 would perform an unsafe optimisation when
given a cons pattern that contained a map and could be folded into a
literal with cerl:fold_literal/1. In this case, when traversing the map
a type variable would be generated, but this variable would be dropped
by the erl_types:t_cons/2 constructor by in turn calling t_sup(),
producing the overapproximation any(). However, in this particular case,
dialyzer_typesig:traverse/3 is not allowed to overapproximate, since its
result is used in an EQ-constraint.
Although erl_types:t_tuple/1 does not overapproximate like t_cons/2,
which makes the bug unlikely to affect tuples too, the fix was
nevertheless applied defensively to the case of tuples as well.
Also, fix a bug where dialyzer_utils:refold_pattern/1 would generate
syntax nodes with two {label, _} attributes.
Diffstat (limited to 'make')
0 files changed, 0 insertions, 0 deletions