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Use pattern matching instead of head

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This commit is contained in:
Joseph C. Sible 2020-02-02 00:13:16 -05:00
parent 76b798394f
commit 115ef29079
1 changed files with 1 additions and 1 deletions
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src/ShellCheck/Analytics.hs
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@ -1298,7 +1298,7 @@ checkArithmeticDeref params t@(TA_Expansion _ [b@(T_DollarBraced id _ _)]) =
unless (isException $ bracedString b) getWarning
where
isException [] = True
isException s = any (`elem` "/.:#%?*@$-!+=^,") s || isDigit (head s)
isException s@(h:_) = any (`elem` "/.:#%?*@$-!+=^,") s || isDigit h
getWarning = fromMaybe noWarning . msum . map warningFor $ parents params t
warningFor t =
case t of