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  • Glasgow Haskell Compiler
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  • #10498
Closed
Open
Created Jun 07, 2015 by dramforever@dramforever

"if ... then \case -> else ..." causes a "missing else clause" error

The following program:

{-# LANGUAGE LambdaCase #-}

foo =
    if True
    then
        \case ->
            1 -> 2
    else id

Produces this message:

problem.hs:4:5:
    parse error in if statement: missing required else clause

The problem in the code is that there's a -> after the \case.

I don't know if a better error message can be generated, but this one is really unhelpful.

Trac metadata
Trac field Value
Version 7.10.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Parser)
Test case
Differential revisions
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