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Fixed

• Enforce AttributeTargets on records. (PR #17207)
• Fix a false positive of the [<TailCall>] analysis in combination with async. (Issue #17237, PR #17241)
• Extended #help directive in fsi to show documentation in the REPL. (PR #17140)
• Fix internal error when dotting into delegates with multiple type parameters. (PR #17227)
• Error for partial implementation of interface with static and non-static abstract members. (Issue #17138, PR #17160)
• Optimize simple mappings with preludes in computed collections. (PR #17067)
• Improve error reporting for abstract members when used in classes. (PR #17063)
• Improve error reporting when property has same name as DU case. (Issue #16646, PR #17088)
• Make typechecking of indexed setters with tuples on the right more consistent. (Issue #16987, PR #17017)
• Static abstract method on classes no longer yields internal error. (Issue #17044, PR #17055)
• Disallow calling abstract methods directly on interfaces. (Issue #14012, Issue #16299, PR #17021)
• Various parenthesization API fixes. (PR #16977)
• Files passed with -embed:relative/path/to/file are not embedded. (Issue #16768)
• Fix bug in optimization of for-loops over integral ranges with steps and units of measure. (Issue #17025, PR #17040, PR #17048)
• Fix calling an overridden virtual static method via the interface (PR #17013)
• Fix state machines compilation, when big decision trees are involved, by removing code split when resumable code is detected (PR #17076)
• Fix for exponential runtime in CE builders when using nested implicit yields PR #17096
• Fix several AND operator parser bugs and regressions (Issue #16447, Issue #17134, Issue #16309, PR #17113)
• Treat exceptions as types in a namespace for graph based type checking (Issue #17262, PR #17268)
• FS0243 - Unrecognized option: '--realsig-' #17561 (Issue #17561, PR #17268)

Added

• Generate new Equals overload to avoid boxing for structural comparison (PR #16857)
• Allow #nowarn to support the FS prefix on error codes to disable warnings (Issue #17206, PR #17209)
• Allow ParsedHashDirectives to have argument types other than strings (Issue #17240, PR #17209)
• Parser: better recovery for unfinished patterns (PR #17231)
• Expose inner exception information of TypeProviders to help diagnostics in IDE (PR #17251)
• Parser: recover on empty match clause (PR #17233)
• Support empty-bodied computation expressions. (Language suggestion #1232, RFC FS-1144 (PR #774), PR #17352)

Changed

• Enforce AttributeTargets.Interface (PR #17173)
• Minor compiler perf improvements. (PR #17130)
• Improve error messages for active pattern argument count mismatch (PR #16846, PR #17186)
• AsyncLocal diagnostics context. (PR #16779)
• Reduce allocations in compiler checking via ValueOption usage (PR #16822)
• Use AsyncLocal instead of ThreadStatic to hold Cancellable.Token (PR #17156)
• Showing and inserting correct name of entities from unopened namespace/module (Issue #14375, PR #17261)
• Improve completion after method/property override (PR #17292)
• Support lazy custom attributes calculation for ILTypeDef public API, improve ExtensionAttribute presence detecting perf. (PR #16168)