swift234

Parser: Always parse '.foo' as expr-postfix when possible.

When a line begins with '.', it's almost always due to a method chain, not an attempt to start an expression with a contextual member lookup. This is a more principled grammar rule than the long tail of hacks we've been putting up to try to accommodate "builder pattern" usages. Fixes rdar://problem/20238557.

Swift SVN r29606