Compile errors are duplicated in output

[jonsequitur]

[ocallesp]

DOESN'T REPRO

https://learn.microsoft.com/en-us/training/modules/csharp-write-first/2-exercise-hello-world

https://dotnet.microsoft.com/en-us/learn/dotnet/in-browser-tutorial/1

mock project

[jonsequitur]

The repro is visible in your screen shots.

The following are duplicates, one containing a line number and the other not containing it.

(2,1): error CS0103: The name 'hmm' does not exist in the current context
; expected
The name 'hmm' does not exist in the current context

[ocallesp]

The repro is visible in your screen shots.

The following are duplicates, one containing a line number and the other not containing it.

(2,1): error CS0103: The name 'hmm' does not exist in the current context
; expected
The name 'hmm' does not exist in the current context

These are two different compiler error numbers which doesn't count as a duplicated output.

In the original image you posted it appears twice each error number.

Are you considering this ?

[jonsequitur]

The bug is that the error message The name 'hmm' does not exist in the current context is shown twice in the output.