It seems that `FirAssignExpressionAltererExtension...

# compiler

[Youssef Shoaib [MOD]]

It seems that FirAssignExpressionAltererExtension never gets called if the lValue is this. In other words, an error gets reported earlier for this = blah, without invoking FirAssignExpressionAltererExtension, and thus it doesn't get the chance to change it. I understand the use-case may be niche, but is there any chance of getting this supported?