Cannot convert struct to interface if it has an embedded struct with a method

[kettek]

Cannot convert struct to interface if it has an embedded struct with a method

[cosmos72]

Commit 4d60a7f detects this bug, and replaces the generic panic message

panic: runtime error: invalid memory address or nil pointer dereference

with the more detailed

panic: repl.go:24:28: cannot convert from <*main.ExtendedEntity> to <main.VEntity>: internal error, method B of <*main.ExtendedEntity> has nil type!
        (known bug under investigation, see https://github.com/cosmos72/gomacro/issues/139)

It's not a solution, but at least I've narrowed it down to a method type being (unexpectedly) nil.

[kettek]

The exact version where this becomes a problem is c545040.

[cosmos72]

Thanks for spotting this, and more thanks for the bisection!

Commit c545040 is a bugfix, which replaces a complicated (and broken) workaround with a clean implementation.
But from the regression you found, it seems the bugfix is not fully correct.

I will investigate it.

[cosmos72]

Bug confirmed.
Interestingly enough, executing the same code at REPL does not trigger the bug.
I suspect some gomacro's implementation confusion between compile-time and runtime.