GHC accepts program with incorrect layout
GHC accepts this program:
f x = case x of
False -> do
{ return x; }
but according to the Haskell report the implicit { opened by the of
should be closed before the explicit {.
The bug does on to say, in a comment:
Update: arguably this should be allowed. The fix to the Haskell
layout rule to allow it is simple: in Section 9.3 in the rules that
govern the introduction of the <n> and {n} psuedo-tokens, we need
to prevent <n> being inserted before {. This could be a simple
side-condition on the rule that introduces <n>.
I can't see a Haskell' ticket for this at first glance.
Trac metadata
Trac field | Value |
---|---|
Version | 6.6 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Parser) |
Test case | read027 |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Unknown |
Architecture | Unknown |