internal error with rebindable if-then-else
Defining ifThenElse in a module with RebindableSyntax enabled and using if-then-else in the same module leads to an internal ghc error.
ifThenElse.hs:
{-# LANGUAGE RebindableSyntax #-}
module IfThenElse (ifThenElse) where
import Prelude (Bool(..))
ifThenElse True t f = t
ifThenElse False t f = f
foo = if True then () else ()
Error message:
# ghc IfThenElse.hs
[1 of 1] Compiling IfThenElse ( IfThenElse.hs, IfThenElse.o )
IfThenElse.hs:10:7:
GHC internal error: `ifThenElse' is not in scope during type checking, but it passed the renamer
tcg_type_env of environment: []
tcl_env of environment: []
In the expression: if True then () else ()
In an equation for `foo': foo = if True then () else ()
Importing ifThenElse from another module (even with RebindableSyntax enabled) will make the error go away.
Trac metadata
Trac field | Value |
---|---|
Version | 7.0.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | p.balzarek@googlemail.com |
Operating system | |
Architecture |