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Reserve prefixed identifiers and string literals (RFC 3101)

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This commit denies any identifiers immediately followed by
one of three tokens `"`, `'` or `#`, which is stricter than
the requirements of RFC 3101 but may be necessary according
to the discussion at [Zulip].

[Zulip]: https://rust-lang.zulipchat.com/#narrow/stream/268952-edition-2021/topic/reserved.20prefixes/near/238470099
This commit is contained in:
lrh2000 2021-05-16 11:10:05 +08:00
parent 831ae3c136
commit 8dee9bc8fc
5 changed files with 172 additions and 7 deletions
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36
src/test/ui/rust-2021/reserved-prefixes.rs Normal file
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@ -0,0 +1,36 @@
// compile-flags: -Z unstable-options --edition 2021
macro_rules! demo2 {
( $a:tt $b:tt ) => { println!("two tokens") };
}
macro_rules! demo3 {
( $a:tt $b:tt $c:tt ) => { println!("three tokens") };
}
macro_rules! demo4 {
( $a:tt $b:tt $c:tt $d:tt ) => { println!("four tokens") };
}
fn main() {
demo3!(foo#bar); //~ ERROR prefix `foo` is unknown
demo2!(foo"bar"); //~ ERROR prefix `foo` is unknown
demo2!(foo'b'); //~ ERROR prefix `foo` is unknown
demo2!(foo'b); //~ ERROR prefix `foo` is unknown
demo3!(foo# bar); //~ ERROR prefix `foo` is unknown
demo4!(foo#! bar); //~ ERROR prefix `foo` is unknown
demo4!(foo## bar); //~ ERROR prefix `foo` is unknown
demo4!(foo#bar#);
//~^ ERROR prefix `foo` is unknown
//~| ERROR prefix `bar` is unknown
demo3!(foo # bar);
demo3!(foo #bar);
demo4!(foo!#bar);
demo4!(foo ##bar);
demo3!(r"foo"#bar);
demo3!(r#foo#bar);
}

92
src/test/ui/rust-2021/reserved-prefixes.stderr Normal file
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@ -0,0 +1,92 @@
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:16:12
|
LL | demo3!(foo#bar);
| ^^^- help: consider inserting a whitespace before this `#`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:17:12
|
LL | demo2!(foo"bar");
| ^^^- help: consider inserting a whitespace before this `"`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:18:12
|
LL | demo2!(foo'b');
| ^^^- help: consider inserting a whitespace before this `'`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:20:12
|
LL | demo2!(foo'b);
| ^^^- help: consider inserting a whitespace before this `'`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:21:12
|
LL | demo3!(foo# bar);
| ^^^- help: consider inserting a whitespace before this `#`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:22:12
|
LL | demo4!(foo#! bar);
| ^^^- help: consider inserting a whitespace before this `#`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:23:12
|
LL | demo4!(foo## bar);
| ^^^- help: consider inserting a whitespace before this `#`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `foo` is unknown
--> $DIR/reserved-prefixes.rs:25:12
|
LL | demo4!(foo#bar#);
| ^^^- help: consider inserting a whitespace before this `#`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: prefix `bar` is unknown
--> $DIR/reserved-prefixes.rs:25:16
|
LL | demo4!(foo#bar#);
| ^^^- help: consider inserting a whitespace before this `#`
| |
| unknown prefix
|
= note: prefixed identifiers and string literals are reserved since Rust 2021
error: aborting due to 9 previous errors