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doc: Document mutable function arguments

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Seo Sanghyeon 2013-01-23 17:20:36 +09:00
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@ -3018,6 +3018,11 @@ Local variables are immutable unless declared with `let mut`. The
declaration (so `let mut x, y` declares two mutable variables, `x` and
`y`).
Function parameters are immutable unless declared with `mut`. The
`mut` keyword applies only to the following parameter (so `|mut x, y|`
and `fn f(mut x: ~int, y: ~int)` declare one mutable variable `x` and
one immutable variable `y`).
Local variables are not initialized when allocated; the entire frame worth of
local variables are allocated at once, on frame-entry, in an uninitialized
state. Subsequent statements within a function may or may not initialize the