`regex-syntax` fails to compile with `unicode-perl` feature

[ThouCheese]

What version of regex are you using?

Regex 1.5.2, regex-syntax 0.6.24

Describe the bug at a high level.

regex-syntax doesn't compile when default features are turned off and unicode-perl is turned on.

What are the steps to reproduce the behavior?

Create a new cargo project and list either regex or regex-syntax with default-features turned off and unicode-perl turned on. Easy repro: clone this git repository: https://github.com/ThouCheese/regex-issue

What is the actual behavior?

I expect this to compile.

What is the expected behavior?

I doesn't compile with the error message:

    |
375 |         use unicode_tables::perl_decimal::DECIMAL_NUMBER;
    |             ^^^^^^^^^^^^^^ use of undeclared crate or module `unicode_tables`

This should be fixed if line 375 is changed to use crate::unicode_tables::perl_decimal::DECIMAL_NUMBER;, I believe.

[BurntSushi]

Dupe of #769.

Thanks for reporting this though!

[BurntSushi]

#771 is a PR in progress to fix this and fix CI so that these regressions actually failed the build.

[ThouCheese]

Too slow! Thanks for the quick reply Andrew!