[erlang-bugs] Dialyzer crashes on empty map case pattern that can never match

[Björn-Egil Dahlberg]

Thank you for reporting this.

I'll have a look at it.

// Björn-Egil

On 2014-04-28 00:00, James Fish wrote:
> Dialyzer crashes when analysing a case clause with an empty map 
> pattern when it is known that the pattern can never match.
>
> Minimal example:
>
> function(Tuple) when is_tuple(Tuple) ->
>     case Tuple of #{} -> ok end.
>
> Result:
>
> dialyzer: Analysis failed with error:
> {{case_clause,#{}},
>  [{cerl_prettypr,lay_literal,2,[{file,"cerl_prettypr.erl"},{line,468}]},
> {cerl_prettypr,lay_ann,2,[{file,"cerl_prettypr.erl"},{line,411}]},
> {cerl_prettypr,format,2,[{file,"cerl_prettypr.erl"},{line,271}]},
>   {dialyzer_dataflow,format_patterns,1,
> [{file,"dialyzer_dataflow.erl"},{line,3351}]},
> {dialyzer_dataflow,do_clause,6,[{file,"dialyzer_dataflow.erl"},{line,1245}]},
>   {dialyzer_dataflow,handle_clauses,9,
> [{file,"dialyzer_dataflow.erl"},{line,1177}]},
>   {dialyzer_dataflow,handle_case,3,
> [{file,"dialyzer_dataflow.erl"},{line,936}]},
>   {dialyzer_dataflow,do_clause,6,
> [{file,"dialyzer_dataflow.erl"},{line,1372}]}]}
>
>
>
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