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Syntax error messages involving unclosed parens are sometimes incorrect #5770

vicuna opened this Issue Oct 1, 2012 · 1 comment


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vicuna commented Oct 1, 2012

Original bug ID: 5770
Reporter: @mauny
Assigned to: @alainfrisch
Status: closed (set by @xavierleroy on 2015-12-11T18:20:03Z)
Resolution: fixed
Priority: low
Severity: minor
Platform: all
OS: all
OS Version: all
Version: 4.00.0
Target version: later
Fixed in version: 4.01.0+dev
Category: ~DO NOT USE (was: OCaml general)
Child of: #5068
Monitored by: @hcarty

Bug description

Parsing invalid patterns inside well-balanced parentheses produces an error message saying that parens don't match.

I provide a patch that fixes the problem by adding a few more error rules in the parser and relevant error messages.

Steps to reproduce

$ echo 'match x with (1 as ) -> 0;;' > /tmp/
$ ocamlc /tmp/ -o /tmp/a
File "/tmp/", line 1, characters 19-20:
Error: Syntax error: ')' expected
File "/tmp/", line 1, characters 13-14:
Error: This '(' might be unmatched

Additional information

After applying the patch, the new error message is

File "/tmp/", line 1, characters 19-20:
Error: Syntax error: identifier expected.

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vicuna commented Oct 16, 2012

Comment author: @alainfrisch

Thanks, I've applied your patch on the trunk (commit 13019) and adapted labltk/browser to support the new error.

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