message: syntax: fix compilation errors with unicode-perl
  When only the unicode-perl feature is enabled, regex-syntax would fail
  to build. It turns out that 'cargo fix' doesn't actually fix all
  imports. It looks like it only fixes things that it can build in the
  current configuration.
  Fixes Fixes
diff: @@ -348,7 +348,7 @@ pub fn perl_space() -> Result<hir::ClassUnicode> {
  #[cfg(all(feature = "unicode-perl", not(feature = "unicode-bool")))]
  fn imp() -> Result<hir::ClassUnicode> {
  - use unicode_tables::perl_space::WHITE_SPACE;
  + use crate::unicode_tables::perl_space::WHITE_SPACE;
  Ok(hir_class(WHITE_SPACE))
  }
  @@ -372,7 +372,7 @@ pub fn perl_digit() -> Result<hir::ClassUnicode> {
  #[cfg(all(feature = "unicode-perl", not(feature = "unicode-gencat")))]
  fn imp() -> Result<hir::ClassUnicode> {
  - use unicode_tables::perl_decimal::DECIMAL_NUMBER;
  + use crate::unicode_tables::perl_decimal::DECIMAL_NUMBER;
  Ok(hir_class(DECIMAL_NUMBER))
  }
  