C++: Output destructors of temporary objects

[jketema]

No description provided.

[rdmarsh2]

I'd expect to see a destructor call for the temporary string at line 1369 of ir.cpp. The AST otherwise looks good to me.

[jketema]

I'd expect to see a destructor call for the temporary string at line 1369 of ir.cpp.

This turns out to be a very interesting case. It's a temporary, by the lifetime is at block scope, not expression scope.

[jketema]

very interesting case. It's a temporary, by the lifetime is at block scope, not expression scope.

This is now fixed.

[jketema]

This PR is now just test updates. All the other parts have been merged into main in separate PRs.

[jketema]

Closing in favour of #15978. That's the 3rd in a series of PRs, which mostly does what was done here, except for some synthetic destructor generation related to throws (that'll be a separate PR).