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match syntax error when pattern identifier appears twice with ellipses the second time #2152

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gfbee opened this issue Jun 26, 2018 · 1 comment · May be fixed by #2231
Open

match syntax error when pattern identifier appears twice with ellipses the second time #2152

gfbee opened this issue Jun 26, 2018 · 1 comment · May be fixed by #2231

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@gfbee
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gfbee commented Jun 26, 2018

In a recent pre-release for Racket 7, and in Racket 6.12, minimal example:

(match 0 [`(,t ,t ...) 0])
t10: unbound identifier; also, no #%top syntax transformer is bound in: t10

Removing the ellipses, or using ellipses with both, or putting the ellipses usage first, are all fine.
@lexi-lambda
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This is related to #1386, which was opened two years ago and is still open. @samth, could you make the relevant change to the documentation to help avoid this confusion?

samth added a commit to samth/racket that referenced this issue Aug 16, 2018
@samth
More consistently report problems with non-linear patterns.
e577c64 
Also document limitation, and suggest a fix.

Closes racket#1386
Closes racket#2152
@samth samth linked a pull request Aug 16, 2018 that will close this issue
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@elibarzilay elibarzilay mentioned this issue Oct 25, 2021
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More consistently report problems with non-linear patterns. samth/racket
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@lexi-lambda @gfbee