[swift-evolution] [Accepted] SE-0028 Modernizing Swift's Debugging Identifiers (__LINE__, etc)

[Chris Lattner]

Proposal Link: https://github.com/apple/swift-evolution/blob/master/proposals/0028-modernizing-debug-identifiers.md

The review of SE-0028 "Modernizing Swift's Debugging Identifiers" ran from January 29… February 2, 2016. The proposal has been *accepted*, with modifications:

* The core team agrees that we should rename all of the existing __FILE__, __LINE__, __COLUMN__, __FUNCTION__, and __DSO_HANDLE__ symbols to lowercase equivalents in the # namespace: #file, #line, #column, #function, #dsohandle.  This includes keeping __FUNCTION__, and making #line have the dual behavior of being a directive when it is the first token on a line, but an expression otherwise.  Renaming these symbols improves uniformity within the Swift language, and keeping all of them provides a smooth transition path from the old syntax to the new syntax.

* The core team isn’t thrilled with the magic “first token on a line” whitespace behavior that #line will be getting, and would like someone to start a discussion about renaming the old #line directive to something more specific and tailored to its purpose.   Once that name and syntax is settled, we can rename the directive and remove the whitespace rule.

* The core team requests that #symbol be split out into a separate proposal, because it needs more detailed design work, and is an additive feature.  For example, it might be appealing to provide a "#mangledName” expression that provides the current symbol as a mangled name: when fed into a demangler, a more structured form of the current symbol would be available.

Thank you to Erica Sadun for driving this forward!

-Chris Lattner
Review Manager
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