Brian Rourke Boll

No compiler error when declaring multiple parameters with the same name in abstract methods

1

**Repro steps** Provide the steps required to reproduce the problem: 1. Define a type with an abstract member having two parameters with the same name. 2. It compiles, generating unutterable...

No compiler error for instance members on static class; produces invalid IL & causes runtime error

1

**Repro steps** 1. Define a static class using the combination of `SealedAttribute` and `AbstractClassAttribute`. 2. Add fields, instance members, even constructors:[^1] a. Fields (mutable or not), properties, methods, indexers. b....

Support F# `Async<'T>` as an awaitable type in minimal APIs

1

I'm opening this as a placeholder to ensure that the changes from https://github.com/dotnet/aspnetcore/pull/46898 make it into the release notes for 9.0. See also: https://github.com/dotnet/aspnetcore/issues/46773. I see that 8.0 had #28596,...

Better integral range lowering: `start..finish`, `start..step..finish`

28

## Description This subsumes #16577 (and #13573). Fixes #938. Fixes #9548. ### Before The compiler currently only optimizes `for`-loops over integral ranges when: 1. The type is `int`/`int32`. 2. The...

Certain tests (6056c45, 6ed642e) needed to be run with langversion `preview` in #16650 to update their IL baselines. This should be removed from these tests once the `LowerIntegralRangesToFastLoops` feature is...

Consider documenting why certain config options exist

4

I think it might be worth augmenting the existing documentation (e.g., [here](https://fsprojects.github.io/fantomas/docs/end-users/Configuration.html)) with some of the following information, where appropriate: 1. Why various configuration options exist. 2. Why the user...

`ReadOnlySpan` initialization from static data

4

Compare https://github.com/dotnet/csharplang/issues/5295 and https://github.com/dotnet/roslyn/pull/24621, ultimately subsumed by https://github.com/dotnet/csharplang/issues/5354. I propose that we add compiler support for translating ```fsharp let data = ReadOnlySpan [|constant; values|] ``` ```fsharp let data = ReadOnlySpan...

Pattern matching spans of chars against constant strings

7

## Proposal I propose that we allow pattern-matching values of type `ReadOnlySpan` and `Span` against constant strings. ```fsharp match "abc123".AsSpan 1 with | "bc123" -> printfn "Matches." | "abc123" ->...

No compile-time error when static abstract member accessed on type parameter whose resolved type has no concrete implementation for said member

2

There is no compile-time error when: 1. You invoke a static abstract member on a type parameter that is constrained to be an interface with the given static abstract member...

There is no compile-time error if a type only partially implements an interface with static abstract members (IWSAM). If you try to use the partial implementation, a `System.TypeLoadException` is raised...