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[5.7] Some trivia fixes#445

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hamishknight merged 9 commits intoswiftlang:swift/release/5.7swiftlang/swift-experimental-string-processing:swift/release/5.7from

hamishknight:trivia-pursuit-5.7hamishknight/swift-experimental-string-processing:trivia-pursuit-5.7Copy head branch name to clipboard

Jun 1, 2022

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Commits on May 27, 2022

• Introduce Source.lookahead

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• Remove `throws` from a couple of lexing methods

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• Add ASTBuilder helper for char class set operations

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• Simplify character class parsing a little

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• Dump the inverted bit of a custom character class

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• Allow empty comments

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• Lex whitespace in range quantifiers

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• Parse end-of-line comments in custom character classes

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• Allow trivia between character class range operands

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