swift234

Member expressions (which refer to properties) require their bases to
be lvalues (materializing them if necessary), as we do with subscript
expressions. Introduce a verifier for member expressions to make sure
this property holds.

Note that there is a slight regression in semantic analysis for
assignments to properties, because we no longer detect some cases of
writing into a property that should not be set. The general solution
to the problem is covered by <rdar://problem/11259972>.



Swift SVN r1530