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Rollup merge of #64912 - lzutao:unneeded-main-doc, r=jonas-schievink

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Remove unneeded `fn main` blocks from docs

## [No whitespace diff](https://github.com/rust-lang/rust/pull/64912/files?w=1)
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Mazdak Farrokhzad 2019-10-01 23:56:23 +02:00 • committed by GitHub
commit 7628cada4f
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18 changed files with 263 additions and 369 deletions
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44
src/liballoc/vec.rs
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@ -389,28 +389,26 @@ impl<T> Vec<T> {
/// use std::ptr;
/// use std::mem;
///
/// fn main() {
/// let mut v = vec![1, 2, 3];
/// let mut v = vec![1, 2, 3];
///
/// // Pull out the various important pieces of information about `v`
/// let p = v.as_mut_ptr();
/// let len = v.len();
/// let cap = v.capacity();
/// // Pull out the various important pieces of information about `v`
/// let p = v.as_mut_ptr();
/// let len = v.len();
/// let cap = v.capacity();
///
/// unsafe {
/// // Cast `v` into the void: no destructor run, so we are in
/// // complete control of the allocation to which `p` points.
/// mem::forget(v);
/// unsafe {
/// // Cast `v` into the void: no destructor run, so we are in
/// // complete control of the allocation to which `p` points.
/// mem::forget(v);
///
/// // Overwrite memory with 4, 5, 6
/// for i in 0..len as isize {
/// ptr::write(p.offset(i), 4 + i);
/// }
///
/// // Put everything back together into a Vec
/// let rebuilt = Vec::from_raw_parts(p, len, cap);
/// assert_eq!(rebuilt, [4, 5, 6]);
/// // Overwrite memory with 4, 5, 6
/// for i in 0..len as isize {
/// ptr::write(p.offset(i), 4 + i);
/// }
///
/// // Put everything back together into a Vec
/// let rebuilt = Vec::from_raw_parts(p, len, cap);
/// assert_eq!(rebuilt, [4, 5, 6]);
/// }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
@ -1391,12 +1389,10 @@ impl<T> Vec<T> {
/// ```
/// #![feature(vec_leak)]
///
/// fn main() {
/// let x = vec![1, 2, 3];
/// let static_ref: &'static mut [usize] = Vec::leak(x);
/// static_ref[0] += 1;
/// assert_eq!(static_ref, &[2, 2, 3]);
/// }
/// let x = vec![1, 2, 3];
/// let static_ref: &'static mut [usize] = Vec::leak(x);
/// static_ref[0] += 1;
/// assert_eq!(static_ref, &[2, 2, 3]);
/// ```
#[unstable(feature = "vec_leak", issue = "62195")]
#[inline]