Error messages are coming out empty

[Tyriar]

Testing #10170

I don't know why this fails and it isn't giving me output.

I have also seen in the past run something that should have given me an error but only showed up later (can't remember if it was a later run or after waiting x seconds)

[rchiodo]

I'm reproing with the same code:

class Complex:
    def __init__(self, realpart, imagpart):
        self.r = realpart
        self.i = imagpart

complex = Complex()

The error output is empty for some reason. Might be a failure parsing the trace?

[rchiodo]

Yeah it works fine if I switch to the other renderer:

Seems like a regression in our trace formatting.

[rchiodo]

Yeah works in stable: