Some combinations of features fail to build #769
Description
What version of regex are you using?
1.5.2, or with regex-syntax 0.6.24 with rust version rustc 1.53.0-nightly (42816d61e 2021-04-24
Describe the bug at a high level.
With default features disabled some feature combinations fail to compile.
What are the steps to reproduce the behavior?
For your Cargo.toml:
[package] name="test" version = "0.1.0" edition = "2018" [dependencies] regex-syntax = { version = "0.6.24", default-features = false, features = ["unicode-perl"] }This will also occur if you select the same feature set through regex:
[package] name="test" version = "0.1.0" edition = "2018" [dependencies] regex = { version = "1.5.2", default-features = false, features = ["std", "unicode-perl"] }What is the actual behavior?
Compiling regex-syntax v0.6.24 error[E0433]: failed to resolve: use of undeclared crate or module `unicode_tables` --> /home/jess/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.24/src/unicode.rs:351:13 | 351 | use unicode_tables::perl_space::WHITE_SPACE; | ^^^^^^^^^^^^^^ use of undeclared crate or module `unicode_tables` error[E0433]: failed to resolve: use of undeclared crate or module `unicode_tables` --> /home/jess/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.24/src/unicode.rs:375:13 | 375 | use unicode_tables::perl_decimal::DECIMAL_NUMBER; | ^^^^^^^^^^^^^^ use of undeclared crate or module `unicode_tables` error[E0425]: cannot find value `WHITE_SPACE` in this scope --> /home/jess/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.24/src/unicode.rs:352:22 | 352 | Ok(hir_class(WHITE_SPACE)) | ^^^^^^^^^^^ not found in this scope | help: consider importing this constant | 1 | use crate::unicode_tables::perl_space::WHITE_SPACE; | error[E0425]: cannot find value `DECIMAL_NUMBER` in this scope --> /home/jess/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.24/src/unicode.rs:376:22 | 376 | Ok(hir_class(DECIMAL_NUMBER)) | ^^^^^^^^^^^^^^ not found in this scope | help: consider importing this constant | 1 | use crate::unicode_tables::perl_decimal::DECIMAL_NUMBER; | error: aborting due to 4 previous errors Some errors have detailed explanations: E0425, E0433. For more information about an error, try `rustc --explain E0425`. error: could not compile `regex-syntax` What is the expected behavior?
The program should compile.