Remove always-on language feature flag: RelaxWhitespace2 - #20320
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
T-Gro
enabled auto-merge (squash)
August 24, 2026 13:44
abonie
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…e2', commit 4507f94a47b615329ba5ebd6afab5846ae3d898e This also takes in 'Extension members solve SRTP constraints (continuation)', commit 7727673ea13f0e09aa46abf6093da050cd16bc3a (dotnet/fsharp#19602), which changed the name of a `SynComponentInfo` from a `LongIdent` to a `SynType option` so that extension members can be declared on tuple types: type (int * int) with member this.Sum = fst this + snd this type struct (int * int) with member this.Sum = fst this + snd this `TypeNameNode.Identifier` is now a `Type` rather than an `IdentListNode`, built through `mkType`, so an ordinary name becomes `Type.LongIdent` and the tuple forms become `Type.Paren(Type.Tuple ...)` and `Type.StructTuple`. The printer uses `genType` for it, so the tuple prints as written and no layout decision was added. A nested module keeps an `IdentListNode` for its name, through `mkModuleName`, since a module name can only be an identifier. The parser only leaves the name out while recovering from a parse error, which never reaches the transformation, so that case is an invariant violation. The RelaxWhitespace2 commit (dotnet/fsharp#20320) only removes a dead feature flag from LexFilter and needed no change.
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Fixes #20160
RelaxWhitespace2has been on for every accepted--langversionsince F# 6.0, so its flag could never be turned off. Removed the dead feature and collapsed the lexer's guarded branches to their enabled behaviour.--disableLanguageFeature:RelaxWhitespace2is no longer a recognised feature name.Part of #20139.