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Fix #17539: UoM ToString on value types returns string instead of string|null Fix #18013: Pipe operator nullness warning location points to nullable argument Fix #18021: No false positive nullness warning for non-null AllowNullLiteral instances Fix #18334: Allow 'not null' constraint on type extensions Fix #19042: Multi-match tuple null elimination with restricting patterns Also adds regression tests for #17727 (Option.toObj inference) and #18034 (FSharpPlus monad CE with nullness).
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Description
Five nullness-related bug fixes and two regression tests for the F# compiler's nullable reference type checking.
Bug Fixes
UoM ToString returns
stringfor value types (fixes Nullness issue - ToString on an integer with UoM takes nullness information from ValueType #17539)int<kg>.ToString()now returnsstringinstead ofstring | nullisMeasureableValueTypehelper inTypedTreeOps.fsMethodCalls.fsto cover measureable value typesPipe operator nullness warning location (fixes Nullness issue - Error shows on incorrect symbol when using |> #18013)
bar |> foo "mr") now point at the nullable argument (bar) instead of the pipe operatorNullnessCheckOfCapturedArgcontext toConstraintSolver, propagated throughCheckExpressions.fsAllowNullLiteral false positive on non-null instances (fixes Nullness issue - No way to silence warning in e.g. ServiceCollection.AddSingleton if type allows null #18021)
MyClass()whereMyClasshas[<AllowNullLiteral>]no longer triggers a false nullness warningTypeNullIsExtraValueNewto check explicit nullness annotation first, only falling back toAllowNullLiteralwhen nullness is ambivalentnot nullconstraint on type extensions (fixes Nullness issue – Invalid type constraint resolution onILookup#18334)type ILookup<'Key, 'Value when 'Key : not null> with ...no longer errorstyparsAEquivWithAddedNotNullConstraintsAllowedfor extension checksCheckTyparsTuple null elimination over-inference (fixes Nullness issue - type check in multi-match expressions doesn't eliminate null #19042)
match x, y with | null, _ -> ... | s, 5 -> test sno longer over-infers non-null when non-wild patterns restrict non-nullable elementsRegression Tests (no code changes, tests only)
Option.toObjinference - ensures input is inferred asstring option, notstring | null optionDelayin monad CE - ensures no crash with or without nullnessChanged Files (13 total)
Source (10 files):
src/Compiler/Checking/CheckDeclarations.fssrc/Compiler/Checking/ConstraintSolver.fs+.fsisrc/Compiler/Checking/Expressions/CheckExpressions.fssrc/Compiler/Checking/MethodCalls.fssrc/Compiler/Driver/CompilerDiagnostics.fssrc/Compiler/Symbols/FSharpDiagnostic.fssrc/Compiler/TypedTree/TypedTreeOps.fs+.fsiTests (3 files):
tests/FSharp.Compiler.ComponentTests/Language/Nullness/NullableReferenceTypesTests.fs(704 lines added)Release notes:
docs/release-notes/.FSharp.Compiler.Service/10.0.300.md