Path expressions - The Rust Reference

# Path expressions

A path used as an expression context denotes either a local variable or an item. Path expressions that resolve to local or static variables are place expressions, other paths are value expressions. Using a `static mut` variable requires an `unsafe` block.

    # #![allow(unused_variables)]
    #fn main() {
    # mod globals {
    #     pub static STATIC_VAR: i32 = 5;
    #     pub static mut STATIC_MUT_VAR: i32 = 7;
    # }
    # let local_var = 3;
    local_var;
    globals::STATIC_VAR;
    unsafe { globals::STATIC_MUT_VAR };
    let some_constructor = Some::<i32>;
    let push_integer = Vec::<i32>::push;
    let slice_reverse = <[i32]>::reverse;
    #}