Change "big ask" to "tall order" in Rustonomicon.

The Rustonomicon's Lifetimes chapter uses the idiom "big ask", which is obscure compared to "tall order" (check Google ngrams). Also, it's easily mistaken for a typo; either "a big task" or "a big thing to ask" could plausibly work there.
pull/10/head
Steve Wooster 9 years ago committed by Manish Goregaokar
parent ef1cd4dd45
commit ae44e86c13

@ -107,8 +107,8 @@ This signature of `as_str` takes a reference to a u32 with *some* lifetime, and
promises that it can produce a reference to a str that can live *just as long*.
Already we can see why this signature might be trouble. That basically implies
that we're going to find a str somewhere in the scope the reference
to the u32 originated in, or somewhere *even earlier*. That's a bit of a big
ask.
to the u32 originated in, or somewhere *even earlier*. That's a bit of a tall
order.
We then proceed to compute the string `s`, and return a reference to it. Since
the contract of our function says the reference must outlive `'a`, that's the

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