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doc/rust.md: Demonstrate the f::<T>() syntax more often #5188

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9 changes: 8 additions & 1 deletion doc/rust.md
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Expand Up @@ -908,6 +908,11 @@ function defined above on `[1, 2]` will instantiate type parameter `T`
with `int`, and require the closure parameter to have type
`fn(int)`.

The type parameters can also be explicitly supplied in a trailing
[path](#paths) component after the function name. This might be necessary
if there is not sufficient context to determine the type parameters. For
example, `sys::size_of::<u32>() == 4`.

Since a parameter type is opaque to the generic function, the set of
operations that can be performed on it is limited. Values of parameter
type can always be moved, but they can only be copied when the
Expand Down Expand Up @@ -2040,12 +2045,14 @@ an optional reference slot to serve as the function's output, bound to the
`lval` on the right hand side of the call. If the function eventually returns,
then the expression completes.

An example of a call expression:
Some examples of call expressions:

~~~~
# fn add(x: int, y: int) -> int { 0 }
# use core::from_str::FromStr::from_str;

let x: int = add(1, 2);
let pi = from_str::<f32>("3.14");
~~~~

### Lambda expressions
Expand Down