[cfe-commits] Patch: Add fix-it for digraph errors involving "<::"

[Richard Trieu]

Detect when the string "<::" is found in code after a cast or template name
and is interpreted as "[:" because of the digraph "<:".  When found, give an
error with a fix-it to add whitespace between the "<" and "::".  Also,
repair the token stream and recover parsing afterwards.
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