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Merged
T-Gro merged 2 commits into from
Dec 31, 2025
+12 −1
Merged

Add support for triple quoted ASCII byte string #19182

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12df5a9
Add support for triple quoted ASCII byte string
kerams Dec 29, 2025
b33e007
Release notes
kerams Dec 29, 2025
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1 change: 1 addition & 0 deletions docs/release-notes/.FSharp.Compiler.Service/11.0.0.md
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Expand Up @@ -21,6 +21,7 @@
* Type checker: recover on checking binding parameter constraints ([#19046](https://github.com/dotnet/fsharp/pull/19046))
* Debugger: provide breakpoint ranges for short lambdas ([#19067](https://github.com/dotnet/fsharp/pull/19067))
* FSharpDiagnostic: add default severity ([#19152](https://github.com/dotnet/fsharp/pull/19152))
* Add support for triple quoted ASCII byte string ([#19182](https://github.com/dotnet/fsharp/pull/19182))

### Changed

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6 changes: 6 additions & 0 deletions src/Compiler/lex.fsl
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Expand Up @@ -1502,6 +1502,12 @@ and tripleQuoteString (sargs: LexerStringArgs) (skip: bool) = parse
let cont = LexCont.Token(args.ifdefStack, args.stringNest)
fin.Finish buf kind LexerStringFinisherContext.TripleQuote cont }

| '"' '"' '"' 'B'
{ let (buf, fin, _m, kind, args) = sargs
args.interpolationDelimiterLength <- 0
let cont = LexCont.Token(args.ifdefStack, args.stringNest)
fin.Finish buf { kind with IsByteString = true } LexerStringFinisherContext.TripleQuote cont }

| newline
{ let (buf, _fin, m, kind, args) = sargs
incrLine lexbuf
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6 changes: 5 additions & 1 deletion tests/fsharp/Compiler/Conformance/BasicGrammarElements/BasicConstants.fs
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Expand Up @@ -9,8 +9,10 @@ module ``Basic Grammar Element Constants`` =

[<Fact>]
let ``Basic constants compile `` () =
let tripleQuotedByteString = " \"\"\" \" \"\"\"B "

CompilerAssert.Pass
"""
$"""
let sbyteConst = 1y
let int16Const = 1us
let int32Const = 1ul
Expand Down Expand Up @@ -42,6 +44,8 @@ let charConst = '1'
let stringConst = "1"
let bytestringConst = "1"B
let byteTripleQuotedStringConst = {tripleQuotedByteString}
let bytecharConst = '1'B
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