crash on assigning result of a switch expression to a constant

[thalber]

Environment data

dotnet --info output: info.txt

VS Code version: 1.93.1
C# Extension version: 2.45.25, 2.39.29, presumably others

OmniSharp log

4-C#.log

Steps to reproduce

1. Open any .cs file in the editor that contains following code:

const float //this is where i forgot to write the rest of the line lol
angVel = (firstChunk.vel.magnitude, angVel, firstChunk.ContactPoint.x, firstChunk.contactPoint.y) switch
{
	( <= 1f, _, _, _) => 0f,
	( >= 1f, 0f, not 0, 0) => Random.Range(5, 10f) * Mathf.Sign(firstChunk.vel.x),
	( >= 1f, _, not 0, -1) => 1f,
	_ => angVel,
};
rot = Mathf.LerpAngle(rot, rot + angVel, 1f);

Expected behavior

A compiler error is displayed for assigning a non-static expression to a const value.

Actual behavior

microsoft.codeanalysis.languageserver.exe crashes with a stack overflow

This causes the LSP to implode. the compiler exhibits similar behavior

Additional context

Bug is seemingly context-independent as it occurs even if i paste the snippet into a completely blank project. Doesn't show up for shorter switches.

[thalber]

i just had an Idea and narrowed it down to this

const float angVel = angVel switch
{
	_ => 0f,
};

[dibarbet]

Can repro, and can repro on the CLI, so likely a compiler bug. Transferring over to Roslyn