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Severe performance regression in 1.8.6 #294

Expose a choice field for SemanticValues in dictionaries #291

• Grammar performance, dictionary case insensitive not accepted #286

• Why "IdentCont" isn't grouped ? #275

Fix https://github.com/yhirose/cpp-peglib/issues/269 and https://github.com/yhirose/cpp-peglib/issues/273 Implement https://github.com/yhirose/cpp-peglib/pull/278 in another way based on `https://github.com/tinfoilboy…

• s.choice() always returns 0 when %whitespace is defined. (#266)
• Compilation error when trying to pass both any& dt and an output param to peg::parser::parse() (#270)

Lint with trace on error segfaults #246

• Support custom error message for definition
• 'message' instruction has been renamed to 'error_message' (Breaking change)