When using multi-line string literal, formatting results in invalid code in 509.0.0

[treastrain]

I'm using swift-format 509.0.0. If I prepare the following sample code and run swift-format format, it formats it into code that cannot be built.

This problem did not occur in swift-format 508.0.0. Is it a bug in swift-format 509.0.0?

import Foundation

@available(*, deprecated, renamed: "num", message: """
This is
multi-line
string
""")
func int() -> Int { 1 }

swift-format format -i Sources/main.swift

import Foundation

@available(
  *, deprecated, renamed: "num",
  message: """This is
  multi-line
  string"""
)
func int() -> Int { 1 }

[allevato]

Have you observed this in other uses of multi-line strings or is it limited to attributes like @available?

[allevato]

Ah-ha, I see the problem. The string here is being represented by SimpleStringLiteralExprSyntax, which literally (😁) only appears in two places: @available annotations and #sourceLocation directives. And we don't handle that node when we format.

This was probably a recent-ish change in swift-syntax that, being so narrow, we didn't have specific test coverage for.