Dave Abrahams 41c53ae729 [stdlib] Give Substring its own views ...

This necessary for ensuring the property that String doesn't keep
inaccessible memory alive.  For example, before this change,

    String(s.dropFirst().unicodeScalars)

would compile and produce a String that owned inaccessible memory.
Now it no longer compiles.

String's view's SubSequences are the same as the Substring's
view. E.g. String.UnicodeScalarView.SubSequence is
Substring.UnicodeScalarView.

New compatibility inits added, to work around the fact that many
previously failable initializers are now non-failable.

2017-07-26 15:59:51 -07:00

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