#3749: unexpected parse errors with `do` and `let`
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Reporter: dherington | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.4
Resolution: invalid | Keywords: do, let, parse error
Difficulty: | Os: Windows
Testcase: | Architecture: x86
Failure: GHC rejects valid program |
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Changes (by simonmar):
* status: new => closed
* difficulty: =>
* resolution: => invalid
Comment:
On what grounds do you think `f2` and `f3` should be syntactically
correct? In both cases, the semi-colon and `return x` are part of the
`let`, not part of the `do`. The layout rule would need multi-token
lookahead in order to determine the alternative parse (inserting a close
brace before the `;`), and it doesn't do that.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3749#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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