Compiling with --backpack with undefined dependency results in "the 'impossible' happened"
Using GHC 8.2.1:
> ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.2.1
And compiling with --backpack
as follows:
> ghc --backpack foo.bkp
[1 of 4] Processing foo-indef
[1 of 2] Compiling Str[sig] ( foo-indef\Str.hsig, nothing )
[2 of 2] Compiling Foo ( foo-indef\Foo.hs, nothing )
[2 of 4] Processing foo-string
Instantiating foo-string
[1 of 1] Compiling Str ( foo-string\Str.hs, foo-string\Str.o )
[3 of 4] Processing foo-int
Instantiating foo-int
[1 of 1] Compiling Str ( foo-int\Str.hs, foo-int\Str.o )
[4 of 4] Processing main
ghc.EXE: panic! (the 'impossible' happened)
(GHC version 8.2.1 for x86_64-unknown-mingw32):
no package name
CallStack (from HasCallStack):
error, called at compiler\backpack\DriverBkp.hs:573:32 in ghc:DriverBkp
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
make: *** [foo-indef/Foo.hi] Error 1
See attached foo.bkp
file. While the Backpack file is invalid, in that the main
unit mentions the foo
dependency, which does not exist, this shouldn't lead to a GHC panic.
Trac metadata
Trac field | Value |
---|---|
Version | 8.2.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |