lookupIfaceGlobal crash with SOURCE import
Try this (in testsuite/tests/stranal/should_compile
)
bash$ ghc -c T8743.hs-boot
bash$ ghc -c T8743.hs
ghc: panic! (the 'impossible' happened)
(GHC version 7.8.2 for x86_64-unknown-linux):
tcIfaceGlobal (local): not found:
main:T8743.$fxToRowMaybe{v r2J}
[(r2L, Class ‘main:T8743.ToRow{tc r2L}’),
(r2M, Data constructor ‘main:T8743.D:ToRow{d r2M}’),
(r2P, Identifier ‘main:T8743.D:ToRow{v r2P}’),
(roB, Identifier ‘main:T8743.toRow{v roB}’),
(rqT, Coercion axiom ‘main:T8743.NTCo:ToRow{tc rqT}’)]
Something clearly wrong here. It think this happens with prettty much any version of GHC. I found this when poking about in #10181.
Edited by Simon Peyton Jones