long float assignment crashed compiler

[ford--prefect]

an assignment of pi with big precision makes rustc go nuts:
code line:

let pi: f64 = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609;

backtrace at http://pastebin.com/4Yb9ezpH

[alexcrichton]

cc @oli-obk

[oli-obk]

this is already "fixed": http://is.gd/6x7P43

see #31407 for more

[hanna-kruppe]

Well not fixed but known and already has an issue.

Man I should really get around to fixing that.

[alexcrichton]

Ah ok, closing as a dupe of #31407