Failing pipelined should assertions report wrong line number in error

[mwrock]

Here is an example that will illustrate this:

Describe "A line number mis calculation" {
    $someValue = "value"

    it "should be 'wrong'" {
        $someValue | should be 'wrong'
    }
}

The resulting pester failure is:

[-]   should be 'value' 101ms
   Expected: {wrong}, But was {value}
   at line: 49 in C:\dev\boxstarter\tests\pester.tests.ps1

Should be line 5 not 49.

[scottmuc]

Hmm, probably didn't notice this because the line number wasn't needed to figure out where my tests were failing during last weeks hacking.

Looks like this needs to be covered by a test somehow. It.ps1 is a pretty messy ball of mud right now and fixing this defect will be a good opportunity to refactor it a little bit.