#4316: Interactive "do" notation in GHCi
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Reporter: mitar | Owner: vivian
Type: feature request | Status: new
Priority: normal | Milestone: 7.2.1
Component: GHCi | Version: 6.12.3
Resolution: | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: None/Unknown |
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Comment(by vivian):
I have a working patch that uses simonmar's idea of checking the lexer
state in alternative layout mode.
There are now a couple of questions with respect to the GHCi documentation
and #3984.
* First, any open context (basically 'do' and 'let') will trigger
multiline mode which is terminated by an empty (cf. blank) line. We can
also define something with a 'let':
{{{
Prelude> let foo = "Hello"
Prelude|
Prelude> foo
"Hello"
}}}
which does not have an associated 'in.' In all these cases, an extra empty
line is required. Where in the documentation should we put this feature?
* #3984 uses {{{:{}}} and {{{}:}}} to open and close a 'multiline' mode.
I think this is now obsolete '''except''' if we want to have a 'where'
clause.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4316#comment:23>
GHC <http://www.haskell.org/ghc/>
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