[SR-1260] ExpressibleByStringInterpolation: can't distinguish between literal components and String arguments

[jtbandes]

Previous ID	SR-1260
Radar	rdar://problem/19800456&18681780
Original Reporter	@jtbandes
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Compiler, Standard Library
Labels	Bug, LanguageFeatureRequest
Assignee	@beccadax
Priority	Medium

md5: f574b07894ad66cb3ff4472ecdd4b26d

relates to:

• SR-2303 ExpressibleByStringInterpolation: ability to restrict types used in string interpolation
• SR-3969 Improve ExpressibleByStringInterpolation

Issue Description:

The interface for ExpressibleByStringInterpolation provides no distinction between components of the literal format string and interpolation components whose type is String.

[dabrahams]

This bug corresponds to <rdar://18681780> (Swift StringInterpolationConvertible should differentiate between base string and string segments)

[beccadax]

Resolved by SE-0228.