Failed assertion reporting does unnecessary string substitution

[LeXofLeviafan]

Suppose I have a test like this:

o('%foo').equals('%ioo')("%doo")

When evaluated, I'd expect for this expression to produce the following output:

%doo

'%foo'
  should equal
'%ioo'

What I'm getting instead is this:

0oo

'NaNoo'
  should equal
'NaNoo'

Now I'm guessing this has to do with format placeholders, but I'm fairly sure that any such substitution should only be performed once (so that it does not affect the inserted text).

Edit: checked o.spec("%foo", () => o("%foo", () => {/* … */})) – these strings are also affected.

[pygy]

@LeXofLeviafan Thanks for the report, this is indeed a bug and I suspect your analysis is correct. I'll look into it.

[pygy]

This will be published soon, probably this evening.