#1628: warning(s) for using stolen syntax that's not currently enabled
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Reporter: Isaac Dupree | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.6.1
Severity: normal | Keywords:
Difficulty: Unknown | Os: Unknown
Testcase: | Architecture: Unknown
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Turning on `-fglasgow-exts` makes {{{f x = id$x}}} break. I propose
having a flag to warn about things like this, enabled by `-Wall`. To be
precise, "stolen syntax" is syntax that means something valid in (usually)
Haskell98 and something different with some extension enabled. If there
are syntax-stealing extensions implemented by other non-GHC compilers, we
may want to warn about those too. (This includes all keywords, possibly
other words like "forall", "exists", "family", unicode symbols for `->`
and others...)
If anyone actually agrees on or implements a (optional) change to unary-
minus, this would subsume the warning aspects of #1318.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1628>
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