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tutorial: clearer explanation of freezing. #12536

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tutorial: clearer explanation of freezing.
Feb 25, 2014
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tutorial: change "--" to an em-dash.
Feb 25, 2014
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tutorial: change instances of "--" to em-dash.
Feb 25, 2014
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8 changes: 4 additions & 4 deletions src/doc/tutorial.md
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Expand Up @@ -1468,14 +1468,14 @@ For a more in-depth explanation of references and lifetimes, read the

## Freezing

Lending an immutable pointer to an object freezes it and prevents mutation.
Lending an &-pointer to an object freezes it and prevents mutation—even if the object was declared as `mut`.
`Freeze` objects have freezing enforced statically at compile-time. An example
of a non-`Freeze` type is [`RefCell<T>`][refcell].

~~~~
let mut x = 5;
{
let y = &x; // `x` is now frozen, it cannot be modified
let y = &x; // `x` is now frozen. It cannot be modified or re-assigned.
}
// `x` is now unfrozen again
# x = 3;
Expand Down Expand Up @@ -2021,8 +2021,8 @@ C++ templates.

## Traits

Within a generic function -- that is, a function parameterized by a
type parameter, say, `T` -- the operations we can do on arguments of
Within a generic function—that is, a function parameterized by a
type parameter, say, `T`—the operations we can do on arguments of
type `T` are quite limited. After all, since we don't know what type
`T` will be instantiated with, we can't safely modify or query values
of type `T`. This is where _traits_ come into play. Traits are Rust's
Expand Down