`make_test` is also called when parsing codeblocks for the playground links so it should handle unwinds from the parser internally.

It hasn't been UB to pass negative numbers to sqrt since https://reviews.llvm.org/D28797 which was included in LLVM 5.

…rror, r=GuillaumeGomez

rustdoc: Avoid panic when parsing codeblocks for playground links

`make_test` is also called when parsing codeblocks for the playground links so it should handle unwinds from the parser internally.

Fixes rust-lang#63016

r? @GuillaumeGomez

…i-obk

Also remove const-hack for abs

Closes rust-lang#67842.

r? @oli-obk

Remove negative number check from float sqrt

It hasn't been UB to pass negative numbers to sqrt since https://reviews.llvm.org/D28797 which was included in LLVM 5.

…entril

Add backticks to various diagnostics

remove bespoke flock bindings

Replaces some `struct flock` definitions with the definition from `libc`.