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Compiler panic with "proc" and GADTs in GHC 8.6.5

This is probably related to #9985 (closed), but that says that GADT patterns are prohibited in proc so presumably I should have gotten an error message. Anyway, I got a compiler panic in GHC 8.6.5 and it asked me to report the bug. So here you are.

Minimal demonstration: Main.hs

Compiler output: out.txt

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