Single-element vec / str append.

[graydon]

This might involve digging in the typechecker a bit; it'd be good for these to
work:

let vec[T] v = ...;
let T t = ...;
v += t;

and

let str s = "hi";
s += 'x';

At the moment both the typechecker and the backend prefer to think of operator

• as only applying to identical-typed values. Which is usually good. This is
  just an exceptional case that might be good to provide support for.

For the time being we can fake it using a single-element temporary vec or a
single-char string. It's just kinda lame. But this is a lower-priority bug.

[jyasskin]

Is there any way at the moment to convert a char or sequence of u8s to a str? Without that, which this bug or an explicit cast would provide, string manipulation becomes pretty hard. For the u8->str conversion, we'll probably want an is_valid_utf8 constraint.

[graydon]

Support single-element append on vec, str. Closed by ddd8fee.

[graydon]

Closed by ddd8fee.

[justinh00k]

error[E0658]: the #[non_exhaustive] attribute is an experimental feature
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrome-devtools-rs-0 .0.0-alpha.0/src/domain/runtime/event/mod.rs:12:1
|
12 | #[non_exhaustive]
| ^^^^^^^^^^^^^^^^^
|
= note: for more information, see #44 109

error[E0658]: the #[non_exhaustive] attribute is an experimental feature
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrome-devtools-rs-0 .0.0-alpha.0/src/domain/runtime/method/mod.rs:15:1
|
15 | #[non_exhaustive]
| ^^^^^^^^^^^^^^^^^
|
= note: for more information, see #44 109

error[E0658]: the #[non_exhaustive] attribute is an experimental feature
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrome-devtools-rs-0 .0.0-alpha.0/src/domain/runtime/method/mod.rs:33:1
|
33 | #[non_exhaustive]
| ^^^^^^^^^^^^^^^^^
|
= note: for more information, see #44 109

error[E0658]: the #[non_exhaustive] attribute is an experimental feature
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrome-devtools-rs-0 .0.0-alpha.0/src/domain/mod.rs:15:1
|
15 | #[non_exhaustive]
| ^^^^^^^^^^^^^^^^^
|
= note: for more information, see #44 109

error: aborting due to 4 previous errors

For more information about this error, try rustc --explain E0658.
error: failed to compile wrangler v1.8.0, intermediate artifacts can be found at /tmp/cargo-installZ5X1eK

Caused by:
could not compile chrome-devtools-rs.

Can't install Cloudflare Wrangler on Ubuntu.