Michael Ilseman 10e9e336fe [stdlib] Fix bug in Substring's _persistentContent ...

Substring's _persistentContent has a fast path that avoids a copy when
the Substring represents the entire outer String. It correctly
detected situations where the wrapped _StringCore was not itself a
slice, but was omitting the extra checks to make sure the Substring's
own range covered the entire String.

Test added.

2017-07-25 14:28:57 -07:00

6.5 KiB

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