[SR-5528] Allow multiple typealiases in a declaration · swiftlang/swift#48100

(3 comments) (0 reactions) (1 assignee)Swift (69,989 stars) (10,719 forks)batch import

compilerfeaturegood first issueparserswift evolution proposal neededtype checkertypealias

説明

md5: 2a0e34842e00129c1149fdebbc72bce0

Issue Description:

https://twitter.com/charlesismcom/status/888488466970955776

It would be consistent with let/var if you could write a comma-separated list of typealiases in one declaration, e.g.:

typealias Tomayto = Tomahto, Potayto = Potahto

技術スタック: swift
領域: developer experience
Issue 種別: feature
難度: 3
推定時間: half day
活動状況: stale
明確さ: clear
前提条件: Swift programmingCompiler basics
初心者向け度: 60
調査方針: Examine how 'let' and 'var' declarations support multiple comma separated bindings in the Swift compiler's parser. Look for the parsing logic in the AST and Sema phases for typealias declarations. Review any comments on the issue for existing discussion. Consider implementing a similar pattern for typealias in the parser (e.g., in 'Parser::parseDeclTypeAlias') and updating the type checker accordingly.