[erlang-bugs] Internal error in beam_dead when using maps in guards

[Anthony Ramine]

This one is due to beam_bool not seeing that {f,6} is used in a put_map instruction in the block preceding the one it is trying to optimise.

I have a fix but IRL work is calling me, will submit it later.

-- 
Anthony Ramine

Le 3 mars 2014 à 08:41, Ulf Norell <ulf.norell@REDACTED> a écrit :

> Replacing the map #{} makes the error go away.
> 
> -module(bug).
> f() when is_map(#{}); false -> ok.
> 
> $ erl
> Erlang/OTP 17 [RELEASE CANDIDATE 2] [erts-6.0] [source-a74e66a] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]
> 
> Eshell V6.0  (abort with ^G)
> 1> c(bug).
> Function f/0 refers to undefined label 6
> bug.erl: internal error in beam_dead;
> crash reason: {case_clause,{'EXIT',{undefined_label,6}}}
> 
>   in function  compile:'-select_passes/2-anonymous-2-'/2 (compile.erl, line 493)
>   in call from compile:'-internal_comp/4-anonymous-1-'/2 (compile.erl, line 290)
>   in call from compile:fold_comp/3 (compile.erl, line 308)
>   in call from compile:internal_comp/4 (compile.erl, line 292)
>   in call from compile:'-do_compile/2-anonymous-0-'/2 (compile.erl, line 153)
> bug.erl:2: Warning: function f/0 is unused
> error
> 
> / Ulf
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