Swift: String interpolation does not support nested string literals

Originator:rix.rob
Number:rdar://17411432 Date Originated:22-Jun-2014 12:41 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode6-Beta2 (6A216f)
Classification:UI/Usability Reproducible:Always
 
Summary:
Currently, you cannot use string literals within string interpolations, making it more difficult to express certain idioms.


Steps to Reproduce:
1. Try to run the following code in a playground or REPL or otherwise:

"[ \(join(" ", [ 1, 2, 3 ])) ]"


Expected Results:
I expected it to be run equivalently to this:

let joined = join(" ", [ 1, 2, 3 ])
"[ \(joined) ]"


Actual Results:
The compiler says “Unexpected '"' character in string interpolation”


Regression:
N/A


Notes:
Balancing/nestable string interpolation is extremely convenient, and syntactically unambiguous. It can get silly—interpolated strings within interpolated strings—but that’s a “it hurts when I do this,” “then don’t do that” issue, in my opinion.

Comments


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