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Allow __unused as arg #3188

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matthewleon wants to merge 2 commits into from
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Allow __unused as arg #3188

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965cc82
rename __unused constant to $unused
matthewleon Jan 1, 2018
34d62e8
add test for __unused name clash
matthewleon Jan 1, 2018
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12 changes: 12 additions & 0 deletions examples/passing/3187-UnusedNameClash.purs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
module Main (main) where

import Prelude ((+))
import Control.Monad.Eff.Console (log)

-- the __unused parameter used to get optimized away
abuseUnused :: forall a. a -> a
abuseUnused __unused = __unused

main = do
let explode = abuseUnused 0 + abuseUnused 0
log "Done"
2 changes: 1 addition & 1 deletion src/Language/PureScript/Constants.hs
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Expand Up @@ -421,7 +421,7 @@ symbol = "Symbol"
-- Code Generation

__unused :: forall a. (IsString a) => a
__unused = "__unused"
__unused = "$unused" -- $ avoids name clashing

-- Modules

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