…4445.

It prevents the test to fail on ppc64el at least.

Part of rust-lang#39015

The line '.expect("failed to read line");' is partly started with a
lower case 'f' and partly with an uppercase one, adding additional
spurious changes to otherwise clean diffs if each sample is
copy-and-pasted over the previous.
This change starts the string with an uppercase everywhere which is in
line with the style of the other strings.

Add missing url in sync structs

r? @frewsxcv

Unit-like structs doc: Improve code sample

r? @steveklabnik

BTW it seems that
```Rust
let p = Proton {};
```
compiles without an error. That's why I didn't add it to the example. It's about consistency anyway.

…tx, r=petrochenkov

Add compile fail test for abi_ptx

Issue rust-lang#39059.

String docs: Add "the"

r? @steveklabnik

Fix link in `if let` docs

r? @steveklabnik

Add a reference to the dl library to the Makefile of the test issue-2…

…4445.

It prevents the test to fail on ppc64el at least.

Part of rust-lang#39015

…ng-game-readme, r=steveklabnik

doc: fix inconsistency in error output in guessing-game.md

The line '.expect("failed to read line");' is partly started with a
lower case 'f' and partly with an uppercase one, adding additional
spurious changes to otherwise clean diffs if each sample is
copy-and-pasted over the previous.
This change starts the string with an uppercase everywhere which is in
line with the style of the other strings.

…labnik

Add abi_x86_interrupt to the unstable book

This PR closes rust-lang#40181.

Fix wrong word used in book page "const and static"