[SR-13232] Property wrappers: $projectedValue syntax chokes on non-ASCII characters

[ole]

Previous ID	SR-13232
Radar	None
Original Reporter	@ole
Type	Bug
Status	Resolved
Resolution	Done

Attachment: Download

Environment

Tested in Xcode 12.0 beta 2 (Swift 5.3) and Xcode 11.5 (Swift 5.2.4).

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, Parser, PropertyWrappers
Assignee	@theblixguy
Priority	Medium

md5: dcf92c5bd51f756e2d49a1e2a2c52ace

is duplicated by:

• SR-14094 Projected value's name is parsed incorrectly if it contains non-ASCII characters

Issue Description:

The last line of this snippet doesn't compile:

@propertyWrapper
struct Wrapper {
  var wrappedValue: Int
  var projectedValue: String {
    String(wrappedValue)
  }
}

struct S {
  @Wrapper var café = 42
}

S().$café // parse/lex error here

Errors:

non-ascii.swift:14:9: error: consecutive statements on a line must be separated by ';'
S().$café
non-ascii.swift:14:5: error: value of type 'S' has no member '$caf'
S().$café
non-ascii.swift:14:9: error: cannot find 'é' in scope
S().$café

It looks like the $projectedValue syntax can't handle non-ASCII characters in the identifier. I tried wrapping it in backticks like this: `$café` or like this: $`café`. But it still doesn't compile.

Changing the variable name to cafe works, of course.

I tried this with several identifiers with non-ASCII characters and/or emoji, always with the same result.

[theblixguy]

Here's a fix: #32961

[theblixguy]

Fixed on master. Please verify using the next available snapshot!

[ole]

@theblixguy Thank you so much for the superfast fix. I will check with the next master snapshot (there doesn't seem to be a newer one than 17 July yet).

[ole]

Fix confirmed with DEVELOPMENT-SNAPSHOT-2020-07-21-a on macOS. Thanks again @theblixguy!