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authorMagnus Lång <[email protected]>2016-04-18 19:01:54 +0200
committerHans Bolinder <[email protected]>2016-04-28 16:16:10 +0200
commit81234c978d1ff1295d20158ed83b296b1f5b1c9f (patch)
tree8cc1e9d6c608f76aa5b3330d410c9c483aedb78f /make
parent80bda0beb9c45a016414009d3a84c502301bece8 (diff)
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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.
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