Fixes for issues with parsing and lexing numbers#5776

Closed

huonw wants to merge 3 commits intorust-lang:incomingfrom huonw:syntax-parse-large-number

+104-30

Commits on Apr 8, 2013

libcore: from_str_common: correctly signal failure on repeating base 2^n numbers.
huonw
committed
libcore: from_str_common: provide option to ignore underscores.
huonw
committed
libsyntax: fail lexing with an error message on an int literal larger than 2^64.
huonw
committed