Module compiled with no_ssa_opt cannot be loaded

[josevalim]

This module:

-module(foo).
-compile(export_all).
-compile([no_ssa_opt]).
start() ->
  case 1 of
    X when hd(X) -> "Will not match";
    X -> "Got 1"
  end.

fails to be loaded:

$ erlc foo
$ erl
Erlang/OTP 26 [DEVELOPMENT] [erts-13.1.4] [source-e35cd70570] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1] [jit]

Eshell V13.1.4 (press Ctrl+G to abort, type help(). for help)
1> foo:start().
=ERROR REPORT==== 16-Mar-2023::14:07:28.175623 ===
beam/beam_load.c(356): Error loading function foo:start/0: op get_hd: Sd:
  bad tag 1 for destination


** exception error: undefined function foo:start/0

I was able to reproduce this on Erlang/OTP 25 and Erlang/OTP 26 (as of 596fae6).

[jhogberg]

Thanks for your report, I've fixed it in #7027 :-)