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 |