Ludovic Courtès <l...@gnu.org> writes: > Tomas Volf <~@wolfsden.cz> skribis: > >> (lambda (expr) >> (let* ((v expr) >> (failure >> (lambda () >> ((@@ (ice-9 match) throw) >> 'match-error >> "match" >> "no matching pattern" >> v) >> #f))) >> #f)) > > Hi! Currently the unused-variable warning pass is unable to determine > that ‘failure’ was introduced by expanding a macro and thus that no > warning should be emitted. > > It’s always been this way and I don’t know of a clear way to fix it.
I cannot really help regarding the general case. However in this
specific it would likely suffice to tweak the expansion to
--8<---------------cut here---------------start------------->8---
(lambda (expr)
(let* ((v expr)
(failure
(lambda ()
((@@ (ice-9 match) throw)
'match-error
"match"
"no matching pattern"
v)
#f)))
failure
#f))
--8<---------------cut here---------------end--------------->8---
Should have zero performance impact due to optimizations (I would hope),
but feels somewhat ugly.
Tomas
--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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