Rollup merge of #64010 - c410-f3r:stabilize-attrs-fn, r=Centril
Stabilize `param_attrs` in Rust 1.39.0
# Stabilization proposal
I propose that we stabilize `#![feature(param_attrs)]`.
Tracking issue: #60406
Version: 1.39 (2019-09-26 => beta, 2019-11-07 => stable).
## What is stabilized
It is now possible to add outer attributes like `#[cfg(..)]` on formal parameters of functions, closures, and function pointer types. For example:
```rust
fn len(
#[cfg(windows)] slice: &[u16],
#[cfg(not(windows))] slice: &[u8],
) -> usize {
slice.len()
}
```
## What isn't stabilized
* Documentation comments like `/// Doc` on parameters.
* Code expansion of a user-defined `#[proc_macro_attribute]` macro used on parameters.
* Built-in attributes other than `cfg`, `cfg_attr`, `allow`, `warn`, `deny`, and `forbid`. Currently, only the lints `unused_variables` and `unused_mut` have effect and may be controlled on parameters.
## Motivation
The chief motivations for stabilizing `param_attrs` include:
* Finer conditional compilation with `#[cfg(..)]` and linting control of variables.
* Richer macro DSLs created by users.
* External tools and compiler internals can take advantage of the additional information that the parameters provide.
For more examples, see the [RFC][rfc motivation].
## Reference guide
In the grammar of function and function pointer, the grammar of variadic tails (`...`) and parameters are changed respectively from:
```rust
FnParam = { pat:Pat ":" }? ty:Type;
VaradicTail = "...";
```
into:
```rust
FnParam = OuterAttr* { pat:Pat ":" }? ty:Type;
VaradicTail = OuterAttr* "...";
```
The grammar of a closure parameter is changed from:
```rust
ClosureParam = pat:Pat { ":" ty:Type }?;
```
into:
```rust
ClosureParam = OuterAttr* pat:Pat { ":" ty:Type }?;
```
More generally, where there's a list of formal (value) parameters separated or terminated by `,` and delimited by `(` and `)`. Each parameter in that list may optionally be prefixed by `OuterAttr+`.
Note that in all cases, `OuterAttr*` applies to the whole parameter and not just the pattern. This distinction matters in pretty printing and in turn for macros.
## History
* On 2018-10-15, @Robbepop proposes [RFC 2565][rfc], "Attributes in formal function parameter position".
* On 2019-04-30, [RFC 2565][rfc] is merged and the tracking issue is made.
* On 2019-06-12, a partial implementation was completed. The implementation was done in [#60669][60669] by @c410-f3r and the PR was reviewed by @petrochenkov and @Centril.
* On 2019-07-29, [#61238][61238] was fixed in [#61856][61856]. The issue fixed was that lint attributes on function args had no effect. The PR was written by @c410-f3r and reviewed by @matthewjasper, @petrochenkov, and @oli-obk.
* On 2019-08-02, a bug [#63210][63210] was filed wherein the attributes on formal parameters would not be passed to macros. The issue was about forgetting to call the relevant method in `fn print_arg` in the pretty printer. In [#63212][63212], written by @Centril on 2019-08-02 and reviewed by @davidtwco, the issue aforementioned was fixed.
* This PR stabilizes `param_attrs`.
## Tests
* [On Rust 2018, attributes aren't permitted on function parameters without a pattern in trait definitions.](https://github.com/rust-lang/rust/blob/master/src/test/ui/rfc-2565-param-attrs/param-attrs-2018.rs)
* [All attributes that should be allowed. This includes `cfg`, `cfg_attr`, and lints check attributes.](https://github.com/rust-lang/rust/blob/master/src/test/ui/rfc-2565-param-attrs/param-attrs-allowed.rs)
* [Built-in attributes, which should be forbidden, e.g., `#[test]`, are.](https://github.com/rust-lang/rust/blob/master/src/test/ui/rfc-2565-param-attrs/param-attrs-builtin-attrs.rs)
* [`cfg` and `cfg_attr` are properly evaluated.](https://github.com/rust-lang/rust/blob/master/src/test/ui/rfc-2565-param-attrs/param-attrs-cfg.rs)
* [`unused_mut`](46f405ec4d/src/test/ui/rfc-2565-param-attrs/param-attrs-cfg.rs) and [`unused_variables`](https://github.com/rust-lang/rust/blob/master/src/test/ui/lint/lint-unused-variables.rs) are correctly applied to parameter patterns.
* [Pretty printing takes formal parameter attributes into account.](https://github.com/rust-lang/rust/blob/master/src/test/ui/rfc-2565-param-attrs/param-attrs-pretty.rs)
## Possible future work
* Custom attributes inside function parameters aren't currently supported but it is something being worked on internally.
* Since documentation comments are syntactic sugar for `#[doc(...)]`, it is possible to allow literal `/// Foo` comments on function parameters.
[rfc motivation]: https://github.com/rust-lang/rfcs/blob/master/text/2565-formal-function-parameter-attributes.md#motivation
[rfc]: https://github.com/rust-lang/rfcs/pull/2565
[60669]: https://github.com/rust-lang/rust/pull/60669
[61856]: https://github.com/rust-lang/rust/pull/61856
[63210]: https://github.com/rust-lang/rust/issues/63210
[61238]: https://github.com/rust-lang/rust/issues/61238
[63212]: https://github.com/rust-lang/rust/pull/63212
This report is a collaborative work with @Centril.
This commit is contained in:
Mazdak Farrokhzad
GitHub
commit
8646c81e8a
@ -1,27 +0,0 @@
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# `param_attrs`
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The tracking issue for this feature is: [#60406]
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[#60406]: https://github.com/rust-lang/rust/issues/60406
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Allow attributes in formal function parameter position so external tools and compiler internals can
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take advantage of the additional information that the parameters provide.
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Enables finer conditional compilation with `#[cfg(..)]` and linting control of variables. Moreover,
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opens the path to richer DSLs created by users.
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------------------------
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Example:
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```rust
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#![feature(param_attrs)]
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fn len(
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#[cfg(windows)] slice: &[u16],
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#[cfg(not(windows))] slice: &[u8],
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) -> usize
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{
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slice.len()
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}
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```
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@ -243,6 +243,8 @@ declare_features! (
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(accepted, async_await, "1.39.0", Some(50547), None),
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/// Allows mixing bind-by-move in patterns and references to those identifiers in guards.
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(accepted, bind_by_move_pattern_guards, "1.39.0", Some(15287), None),
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/// Allows attributes in formal function parameters.
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(accepted, param_attrs, "1.39.0", Some(60406), None),
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// -------------------------------------------------------------------------
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// feature-group-end: accepted features
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@ -489,9 +489,6 @@ declare_features! (
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/// Allows the user of associated type bounds.
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(active, associated_type_bounds, "1.34.0", Some(52662), None),
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/// Attributes on formal function params.
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(active, param_attrs, "1.36.0", Some(60406), None),
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/// Allows calling constructor functions in `const fn`.
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(active, const_constructor, "1.37.0", Some(61456), None),
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@ -812,7 +812,6 @@ pub fn check_crate(krate: &ast::Crate,
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}
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}
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gate_all!(param_attrs, "attributes on function parameters are unstable");
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gate_all!(let_chains, "`let` expressions in this position are experimental");
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gate_all!(async_closure, "async closures are unstable");
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gate_all!(yields, generators, "yield syntax is experimental");
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@ -19,13 +19,6 @@ const DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG: &str = "an inner attribute is not \
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permitted in this context";
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impl<'a> Parser<'a> {
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crate fn parse_param_attributes(&mut self) -> PResult<'a, Vec<ast::Attribute>> {
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let attrs = self.parse_outer_attributes()?;
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self.sess.gated_spans.param_attrs.borrow_mut()
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.extend(attrs.iter().map(|a| a.span));
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Ok(attrs)
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}
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/// Parses attributes that appear before an item.
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crate fn parse_outer_attributes(&mut self) -> PResult<'a, Vec<ast::Attribute>> {
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let mut attrs: Vec<ast::Attribute> = Vec::new();
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@ -49,8 +49,6 @@ static_assert_size!(PResult<'_, bool>, 16);
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/// used and should be feature gated accordingly in `check_crate`.
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#[derive(Default)]
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pub struct GatedSpans {
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/// Spans collected for gating `param_attrs`, e.g. `fn foo(#[attr] x: u8) {}`.
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pub param_attrs: Lock<Vec<Span>>,
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/// Spans collected for gating `let_chains`, e.g. `if a && let b = c {}`.
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pub let_chains: Lock<Vec<Span>>,
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/// Spans collected for gating `async_closure`, e.g. `async || ..`.
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@ -979,7 +979,7 @@ impl<'a> Parser<'a> {
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is_name_required: impl Fn(&token::Token) -> bool,
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) -> PResult<'a, Param> {
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let lo = self.token.span;
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let attrs = self.parse_param_attributes()?;
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let attrs = self.parse_outer_attributes()?;
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if let Some(mut param) = self.parse_self_param()? {
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param.attrs = attrs.into();
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return self.recover_bad_self_param(param, is_trait_item);
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@ -1362,7 +1362,7 @@ impl<'a> Parser<'a> {
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/// Returns the parsed optional self parameter with attributes and whether a self
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/// shortcut was used.
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fn parse_self_parameter_with_attrs(&mut self) -> PResult<'a, Option<Param>> {
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let attrs = self.parse_param_attributes()?;
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let attrs = self.parse_outer_attributes()?;
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let param_opt = self.parse_self_param()?;
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Ok(param_opt.map(|mut param| {
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param.attrs = attrs.into();
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@ -1176,7 +1176,7 @@ impl<'a> Parser<'a> {
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/// Parses a parameter in a closure header (e.g., `|arg, arg|`).
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fn parse_fn_block_param(&mut self) -> PResult<'a, Param> {
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let lo = self.token.span;
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let attrs = self.parse_param_attributes()?;
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let attrs = self.parse_outer_attributes()?;
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let pat = self.parse_pat(PARAM_EXPECTED)?;
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let t = if self.eat(&token::Colon) {
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self.parse_ty()?
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@ -3,7 +3,7 @@
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// Exercise the unused_mut attribute in some positive and negative cases
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#![deny(unused_mut)]
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#![feature(async_closure, param_attrs)]
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#![feature(async_closure)]
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async fn baz_async(
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mut a: i32,
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@ -1,7 +1,7 @@
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// compile-flags: --cfg something
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// edition:2018
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#![feature(async_closure, param_attrs)]
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#![feature(async_closure)]
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#![deny(unused_variables)]
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async fn foo_async(
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@ -2,14 +2,10 @@ pub fn f(
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/// Comment
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//~^ ERROR documentation comments cannot be applied to function parameters
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//~| NOTE doc comments are not allowed here
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//~| ERROR attributes on function parameters are unstable
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//~| NOTE https://github.com/rust-lang/rust/issues/60406
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id: u8,
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/// Other
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//~^ ERROR documentation comments cannot be applied to function parameters
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//~| NOTE doc comments are not allowed here
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//~| ERROR attributes on function parameters are unstable
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//~| NOTE https://github.com/rust-lang/rust/issues/60406
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a: u8,
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) {}
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@ -1,5 +1,5 @@
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error: attributes cannot be applied to a function parameter's type
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--> $DIR/fn-arg-doc-comment.rs:16:12
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--> $DIR/fn-arg-doc-comment.rs:12:12
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|
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LL | fn bar(id: #[allow(dead_code)] i32) {}
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| ^^^^^^^^^^^^^^^^^^^ attributes are not allowed here
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@ -11,31 +11,13 @@ LL | /// Comment
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| ^^^^^^^^^^^ doc comments are not allowed here
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error: documentation comments cannot be applied to function parameters
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--> $DIR/fn-arg-doc-comment.rs:8:5
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--> $DIR/fn-arg-doc-comment.rs:6:5
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|
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LL | /// Other
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| ^^^^^^^^^ doc comments are not allowed here
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error[E0658]: attributes on function parameters are unstable
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--> $DIR/fn-arg-doc-comment.rs:2:5
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LL | /// Comment
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| ^^^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/60406
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= help: add `#![feature(param_attrs)]` to the crate attributes to enable
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error[E0658]: attributes on function parameters are unstable
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--> $DIR/fn-arg-doc-comment.rs:8:5
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|
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LL | /// Other
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/60406
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= help: add `#![feature(param_attrs)]` to the crate attributes to enable
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error[E0308]: mismatched types
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--> $DIR/fn-arg-doc-comment.rs:22:7
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--> $DIR/fn-arg-doc-comment.rs:18:7
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|
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LL | f("", "");
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| ^^ expected u8, found reference
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@ -44,7 +26,7 @@ LL | f("", "");
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found type `&'static str`
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error[E0308]: mismatched types
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--> $DIR/fn-arg-doc-comment.rs:22:11
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--> $DIR/fn-arg-doc-comment.rs:18:11
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|
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LL | f("", "");
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| ^^ expected u8, found reference
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@ -53,7 +35,7 @@ LL | f("", "");
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found type `&'static str`
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error[E0308]: mismatched types
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--> $DIR/fn-arg-doc-comment.rs:29:9
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--> $DIR/fn-arg-doc-comment.rs:25:9
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|
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LL | bar("");
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| ^^ expected i32, found reference
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@ -61,7 +43,6 @@ LL | bar("");
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= note: expected type `i32`
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found type `&'static str`
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error: aborting due to 8 previous errors
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error: aborting due to 6 previous errors
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Some errors have detailed explanations: E0308, E0658.
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For more information about an error, try `rustc --explain E0308`.
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For more information about this error, try `rustc --explain E0308`.
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@ -1,7 +1,5 @@
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// edition:2018
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#![feature(param_attrs)]
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trait Trait2015 { fn foo(#[allow(C)] i32); }
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//~^ ERROR expected one of `:`, `@`, or `|`, found `)`
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@ -1,5 +1,5 @@
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error: expected one of `:`, `@`, or `|`, found `)`
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--> $DIR/param-attrs-2018.rs:5:41
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--> $DIR/param-attrs-2018.rs:3:41
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|
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LL | trait Trait2015 { fn foo(#[allow(C)] i32); }
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| ^ expected one of `:`, `@`, or `|` here
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@ -2,7 +2,6 @@
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// compile-flags: --cfg something
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#![deny(unused_mut)]
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#![feature(param_attrs)]
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extern "C" {
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fn ffi(
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@ -1,5 +1,3 @@
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#![feature(param_attrs)]
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extern "C" {
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fn ffi(
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/// Foo
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@ -1,311 +1,311 @@
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:7:9
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--> $DIR/param-attrs-builtin-attrs.rs:5:9
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|
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LL | #[test] a: i32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:23:5
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--> $DIR/param-attrs-builtin-attrs.rs:21:5
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|
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LL | #[test] a: u32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:38:5
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--> $DIR/param-attrs-builtin-attrs.rs:36:5
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|
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LL | #[test] a: u32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:58:9
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--> $DIR/param-attrs-builtin-attrs.rs:56:9
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|
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LL | #[test] a: i32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:79:9
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--> $DIR/param-attrs-builtin-attrs.rs:77:9
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|
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LL | #[test] a: i32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:98:9
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--> $DIR/param-attrs-builtin-attrs.rs:96:9
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|
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LL | #[test] a: i32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:117:9
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--> $DIR/param-attrs-builtin-attrs.rs:115:9
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|
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LL | #[test] a: i32,
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| ^^^^^^^
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error: expected an inert attribute, found an attribute macro
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--> $DIR/param-attrs-builtin-attrs.rs:134:9
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--> $DIR/param-attrs-builtin-attrs.rs:132:9
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|
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LL | #[test] a: u32,
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| ^^^^^^^
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error: documentation comments cannot be applied to function parameters
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--> $DIR/param-attrs-builtin-attrs.rs:5:9
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--> $DIR/param-attrs-builtin-attrs.rs:3:9
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|
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LL | /// Foo
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| ^^^^^^^ doc comments are not allowed here
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error: documentation comments cannot be applied to function parameters
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--> $DIR/param-attrs-builtin-attrs.rs:7:9
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|
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LL | /// Bar
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| ^^^^^^^ doc comments are not allowed here
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error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
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--> $DIR/param-attrs-builtin-attrs.rs:9:9
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|
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LL | /// Bar
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| ^^^^^^^ doc comments are not allowed here
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LL | #[must_use]
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| ^^^^^^^^^^^
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|
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error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
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error: documentation comments cannot be applied to function parameters
|
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--> $DIR/param-attrs-builtin-attrs.rs:11:9
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|
|
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LL | #[must_use]
|
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| ^^^^^^^^^^^
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LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
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--> $DIR/param-attrs-builtin-attrs.rs:13:9
|
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|
|
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LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
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error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:15:9
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:21:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:19:5
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:23:5
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:25:5
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:27:5
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:29:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:27:5
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:31:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:29:5
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:36:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:34:5
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:40:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:38:5
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:42:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:40:5
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:44:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:42:5
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:46:5
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:44:5
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:53:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:51:9
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:56:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:54:9
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:58:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:60:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:62:9
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:64:9
|
||||
|
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:66:9
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:74:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:72:9
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:77:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:75:9
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:79:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:81:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:83:9
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:85:9
|
||||
|
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:87:9
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:93:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:91:9
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:96:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:94:9
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:98:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:100:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:102:9
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:104:9
|
||||
|
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:106:9
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:112:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:110:9
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:115:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:113:9
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:117:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:119:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:121:9
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:123:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:121:9
|
||||
|
|
||||
LL | /// Qux
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:125:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:123:9
|
||||
|
|
||||
LL | #[no_mangle] b: i32,
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:132:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:130:9
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:136:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:134:9
|
||||
|
|
||||
LL | /// Bar
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:138:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:136:9
|
||||
|
|
||||
LL | #[must_use]
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:140:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:138:9
|
||||
|
|
||||
LL | /// Baz
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error: allow, cfg, cfg_attr, deny, forbid, and warn are the only allowed built-in attributes in function parameters
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:142:9
|
||||
--> $DIR/param-attrs-builtin-attrs.rs:140:9
|
||||
|
|
||||
LL | #[no_mangle] b: i32
|
||||
| ^^^^^^^^^^^^
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
// compile-flags: --cfg something
|
||||
// edition:2018
|
||||
|
||||
#![feature(async_closure, param_attrs)]
|
||||
#![feature(async_closure)]
|
||||
#![deny(unused_variables)]
|
||||
|
||||
extern "C" {
|
||||
|
||||
@ -1,16 +0,0 @@
|
||||
// gate-test-param_attrs
|
||||
|
||||
#![deny(unused_variables)]
|
||||
|
||||
fn foo(
|
||||
/// Foo
|
||||
//~^ ERROR documentation comments cannot be applied to function parameters
|
||||
//~| NOTE doc comments are not allowed here
|
||||
//~| ERROR attributes on function parameters are unstable
|
||||
//~| NOTE https://github.com/rust-lang/rust/issues/60406
|
||||
#[allow(unused_variables)] a: u8
|
||||
//~^ ERROR attributes on function parameters are unstable
|
||||
//~| NOTE https://github.com/rust-lang/rust/issues/60406
|
||||
) {}
|
||||
|
||||
fn main() {}
|
||||
@ -1,27 +0,0 @@
|
||||
error: documentation comments cannot be applied to function parameters
|
||||
--> $DIR/param-attrs-feature-gate.rs:6:5
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^ doc comments are not allowed here
|
||||
|
||||
error[E0658]: attributes on function parameters are unstable
|
||||
--> $DIR/param-attrs-feature-gate.rs:6:5
|
||||
|
|
||||
LL | /// Foo
|
||||
| ^^^^^^^
|
||||
|
|
||||
= note: for more information, see https://github.com/rust-lang/rust/issues/60406
|
||||
= help: add `#![feature(param_attrs)]` to the crate attributes to enable
|
||||
|
||||
error[E0658]: attributes on function parameters are unstable
|
||||
--> $DIR/param-attrs-feature-gate.rs:11:5
|
||||
|
|
||||
LL | #[allow(unused_variables)] a: u8
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= note: for more information, see https://github.com/rust-lang/rust/issues/60406
|
||||
= help: add `#![feature(param_attrs)]` to the crate attributes to enable
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0658`.
|
||||
@ -2,7 +2,6 @@
|
||||
|
||||
// check-pass
|
||||
|
||||
#![feature(param_attrs)]
|
||||
#![feature(c_variadic)]
|
||||
|
||||
extern crate param_attrs;
|
||||
|
||||
@ -1,6 +1,5 @@
|
||||
// aux-build:ident-mac.rs
|
||||
|
||||
#![feature(param_attrs)]
|
||||
#![feature(c_variadic)]
|
||||
|
||||
extern crate ident_mac;
|
||||
|
||||
@ -1,149 +1,149 @@
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:11:21
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:10:21
|
||||
|
|
||||
LL | extern "C" { fn ffi(#[id] arg1: i32, #[id] ...); }
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:11:38
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:10:38
|
||||
|
|
||||
LL | extern "C" { fn ffi(#[id] arg1: i32, #[id] ...); }
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:15:38
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:14:38
|
||||
|
|
||||
LL | unsafe extern "C" fn cvar(arg1: i32, #[id] mut args: ...) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:18:28
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:17:28
|
||||
|
|
||||
LL | type Alias = extern "C" fn(#[id] u8, #[id] ...);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:18:38
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:17:38
|
||||
|
|
||||
LL | type Alias = extern "C" fn(#[id] u8, #[id] ...);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:22:9
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:21:9
|
||||
|
|
||||
LL | fn free(#[id] arg1: u8) {
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:24:16
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:23:16
|
||||
|
|
||||
LL | let lam = |#[id] W(x), #[id] y| ();
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:24:28
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:23:28
|
||||
|
|
||||
LL | let lam = |#[id] W(x), #[id] y| ();
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:30:18
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:29:18
|
||||
|
|
||||
LL | fn inherent1(#[id] self, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:30:30
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:29:30
|
||||
|
|
||||
LL | fn inherent1(#[id] self, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:33:18
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:32:18
|
||||
|
|
||||
LL | fn inherent2(#[id] &self, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:33:31
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:32:31
|
||||
|
|
||||
LL | fn inherent2(#[id] &self, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:36:22
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:35:22
|
||||
|
|
||||
LL | fn inherent3<'a>(#[id] &'a mut self, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:36:42
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:35:42
|
||||
|
|
||||
LL | fn inherent3<'a>(#[id] &'a mut self, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:39:22
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:38:22
|
||||
|
|
||||
LL | fn inherent4<'a>(#[id] self: Box<Self>, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:39:45
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:38:45
|
||||
|
|
||||
LL | fn inherent4<'a>(#[id] self: Box<Self>, #[id] arg1: u8) {}
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:45:15
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:44:15
|
||||
|
|
||||
LL | fn trait1(#[id] self, #[id] arg1: u8);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:45:27
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:44:27
|
||||
|
|
||||
LL | fn trait1(#[id] self, #[id] arg1: u8);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:48:15
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:47:15
|
||||
|
|
||||
LL | fn trait2(#[id] &self, #[id] arg1: u8);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:48:28
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:47:28
|
||||
|
|
||||
LL | fn trait2(#[id] &self, #[id] arg1: u8);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:51:19
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:50:19
|
||||
|
|
||||
LL | fn trait3<'a>(#[id] &'a mut self, #[id] arg1: u8);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:51:39
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:50:39
|
||||
|
|
||||
LL | fn trait3<'a>(#[id] &'a mut self, #[id] arg1: u8);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:54:19
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:53:19
|
||||
|
|
||||
LL | fn trait4<'a>(#[id] self: Box<Self>, #[id] arg1: u8, #[id] Vec<u8>);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:54:42
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:53:42
|
||||
|
|
||||
LL | fn trait4<'a>(#[id] self: Box<Self>, #[id] arg1: u8, #[id] Vec<u8>);
|
||||
| ^^^^^
|
||||
|
||||
error: expected an inert attribute, found an attribute macro
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:54:58
|
||||
--> $DIR/proc-macro-cannot-be-used.rs:53:58
|
||||
|
|
||||
LL | fn trait4<'a>(#[id] self: Box<Self>, #[id] arg1: u8, #[id] Vec<u8>);
|
||||
| ^^^^^
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user