[SR-1882] String Interpolation of Optionals

[swift-ci]

Previous ID	SR-1882
Radar	None
Original Reporter	charlieMonroe (JIRA User)
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug
Assignee	@CodaFi
Priority	Medium

md5: e1503011ac1e37a08f927145f540894c

Issue Description:

As per discussion on Swift evolution (http://thread.gmane.org/gmane.comp.lang.swift.evolution/17575), Chris Lattner suggested it doesn't need to go through Swift evolution.

Interpolation of an Optional should create a warning and offer two fix-it suggestions (http://article.gmane.org/gmane.comp.lang.swift.evolution/20960):

a) Add redundant parentheses around the expression to silence the warning,
b) Add " ?? <#placeholder#>" for adding a default value.

I've originally thought I'd have a whack at it, but I won't have time until mid July to look around the compiler code, so I'm filing this as a bug report if anyone can get to it faster.

[CodaFi]

Resolved by the merge of #5110