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Opened by Ben Gamari@bgamari🐢Maintainer

T367_letnoescape coaxes LLVM backend into producing invalid IR

The nightly armv7 job reveals that the LLVM backend produces invalid LLVM IR for the T367_letnoescape testcase:

Compile failed (exit code 1) errors were:
[1 of 1] Compiling Main             ( T367_letnoescape.hs, T367_letnoescape.o )
Entry block to function must not have predecessors!
label %c2T7
opt: /tmp/ghc53214_0/ghc_2.ll: error: input module is broken!
`opt' failed in phase `LLVM Optimiser'. (Exit code: 1)

*** unexpected failure for T367_letnoescape(threaded2)

The following ways are affected:

   concurrent/should_run/T367_letnoescape.run        T367_letnoescape [exit code non-0] (dyn)
   concurrent/should_run/T367_letnoescape.run        T367_letnoescape [exit code non-0] (hpc)
   concurrent/should_run/T367_letnoescape.run        T367_letnoescape [exit code non-0] (profasm)
   concurrent/should_run/T367_letnoescape.run        T367_letnoescape [exit code non-0] (profthreaded)
   concurrent/should_run/T367_letnoescape.run        T367_letnoescape [exit code non-0] (threaded2)
Edited by Ben Gamari