some expressions are skipped during mutation phase

Current version (not released) fails to generate mutants for some expressions. Example:

namespace Test 
{
    using System;
    public static class CharCheckExtensions
    {
        public static string ChainCalls(string check)
        {
            return check.Replace("ab", "cd")
                .Replace("12", "34")
                .PadLeft(12)
                .Replace("12", "34");
        }
    }
}

After reviewing MutantOrchestrator.cs I understand that it is due to neglecting the ‘Expression’ properties for InvocationExpressionSyntax. As it represents the target for the invocation, one would logically assume it simply provides some variable name. It turns out that chained calls, as in the previous example, the ‘Expression’ member can contains quite some code as one can see here:sharplab.

[dupdob]

Note: Previous close was a mishap Morning update: almost there current stryker release: 1717 mutants, 1604 ready (4 failed rollbacks) head of repo: 933 mutants, 898 ready (2 failed rollbacks)

my WIP: 1727 mutants, 1707 ready (0 failed rollback)

I am really happy with the current status: got 100+ new mutants, no failed rollback, only a handful of CompileError (remaining causes are : undetectable string concatenation and LinqMutants on non Linq methods). Location data has been restored for most mutants, some remaining to be done.

[dupdob]

I am working on a fix.