Type of capture is broken in body of lambda with explicit object parameter

https://godbolt.org/z/W9aW4Gvfo
https://godbolt.org/z/Yd9qanx55

Replacing explicit object parameter with normal parameter list can be correctly rejected.

Start with the two Compiler Explorer reproducers linked in the issue and compare the behavior of lambdas with explicit object parameters against normal parameter lists. Trace the compiler entry point that handles capture analysis for this lambda form. Done means the broken case is correctly rejected, matching the normal-parameter case, with a regression test for both examples.

Written by the indexing model from the issue text.