String constants inside build script are altered by Cake

[smax48]

What You Are Seeing?

Cake adds double-slash comments ("\\") to string constants inside a script that have a specific format.

What is Expected?

Cake shouldn't alter constants in scripts :)

What version of Cake are you using?

Version 0.22.2+Branch.main.Sha.c8630875bc14ce11aa758e0dcd55f691da5f602b

Are you running on a 32 or 64 bit system?

64

What environment are you running on? Windows? Linux? Mac?

Windows

Are you running on a CI Server? If so, which one?

no

How Did You Get This To Happen? (Steps to Reproduce)

Simple script to reproduce the problem:
!!! It produces a strange response only when there's no white spaces before using or just normal spaces. It works correctly with tabs :) !!!

Task("Default")
    .Does(() => {

    var sb = new System.Text.StringBuilder();
    sb.AppendLine(@"
using System.Collections.Generic;
using System;
namespace Test.Ns
{		
}
    ");

    Information(sb);	
});

RunTarget("Default");

This outputs:

========================================
Default
========================================

//using System.Collections.Generic;
//using System;
namespace Test.Ns
{
}

[devlead]

This is likely because the using statement preprocessor, to confirm if you do a

string.Join(
    "\r\n", 
    "using System;", 
    "namespace Test.Ns", 
    "{", 
    "}" 
);

It'll likely work.

[smax48]

Yes, in my code I did a similar thing - simple string concatenation with "+", and it worked.
I was very surprised when I saw comments in output, but after some time I thought it might be because of some kind of preprocessing...

[devlead]

Yes it's preprocessing being done, using directives are passed a long to the Roslyn compiler as just list of namespaces. they're commented out to not interfere with compilation and to preserve line numbers.