[GHC] #14527: Warn on recursive bindings
GHC
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Tue Nov 28 10:35:27 UTC 2017
#14527: Warn on recursive bindings
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Reporter: chrisdone | Owner: (none)
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.2.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by simonpj):
> So I'm afraid it's less straight-forward than I hoped.
It's only a warning so it's ok to have ad-hoc (but still well specified)
conditions. For example: you get a warning if
* The binding is recursive (or part of a recursive group)
* It is a pattern or simple variable binding; that is there are no
argument on the LHS
* The LHS does not have a top-level tilde
* The RHS is not a syntactic value.
Then define syntactic values to be: literal, constructor application,
lambda, `\case`, etc. (This is the slightly ad-hoc bit.)
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14527#comment:13>
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