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Empty language crashes alex with (Array.!): undefined array element #164

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andreasabel opened this issue Oct 10, 2020 · 0 comments

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andreasabel commented Oct 10, 2020

Alex does not seem to handle the empty language well. MWE:

alex --version
echo ":- [] ;" > Test.x
alex Test.x

gives

Alex version 3.2.6, (c) 2003 Chris Dornan and Simon Marlow
alex: (Array.!): undefined array element

I think Alex should report a proper error, or find a way to handle the empty language (e.g. by ignoring it as it can never match anything).

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andreasabel mentioned this issue

Empty regular expression crashes Alex BNFC/bnfc#388

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