A function's return type is supposed to indicate the kind of data that it
produces.
Rust's "never" type, which is
denoted by an exclamation mark ("!" , is the type the language uses to mark
a function that never returns and other places where a value can never occur.
For
a long time, the never type was used internally by the compiler, but was
considered an unstable feature. On
August�24, after more than two years of work,
Rust-compiler-contributor "waffle" finally managed to stabilize the type. It
took so long, in part, because it involved a small breaking
change to previous Rust editions, which the compiler maintainers needed to
ensure did not impact much real code.
https://lwn.net/Articles/1091015/
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