| Age | Commit message (Collapse) | Author | Lines |
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Support `?Sized` in where clauses
Implemented as described in https://github.com/rust-lang/rust/issues/20503#issuecomment-258677026 - `?Trait` bounds are moved on type parameter definitions when possible, reported as errors otherwise.
(It'd be nice to unify bounds and where clauses in HIR, but this is mostly blocked by rustdoc now - it needs to render bounds in pleasant way and the best way to do it so far is to mirror what was written in source code.)
Fixes https://github.com/rust-lang/rust/issues/20503
r? @nikomatsakis
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Provide hint when cast needs a dereference
For a given code:
``` rust
vec![0.0].iter().map(|s| s as i16).collect::<Vec<i16>>();
```
display:
``` nocode
error: casting `&f64` as `i16` is invalid
--> file3.rs:2:35
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2 | vec![0.0].iter().map(|s| s as i16).collect::<Vec<i16>>();
| - ^^^
| |
| did you mean `*s`?
```
instead of:
``` nocode
error: casting `&f64` as `i16` is invalid
--> <anon>:2:30
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2 | vec![0.0].iter().map(|s| s as i16).collect();
| ^^^^^^^^
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= help: cast through a raw pointer first
```
Fixes #37338.
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add --crate-type metadata
r? @alexcrichton
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Implement the `loop_break_value` feature.
This implements RFC 1624, tracking issue #37339.
- `FnCtxt` (in typeck) gets a stack of `LoopCtxt`s, which store the
currently deduced type of that loop, the desired type, and a list of
break expressions currently seen. `loop` loops get a fresh type
variable as their initial type (this logic is stolen from that for
arrays). `while` loops get `()`.
- `break {expr}` looks up the broken loop, and unifies the type of
`expr` with the type of the loop.
- `break` with no expr unifies the loop's type with `()`.
- When building MIR, loops no longer construct a `()` value at
termination of the loop; rather, the `break` expression assigns the
result of the loop.
- ~~I have also changed the loop scoping in MIR-building so that the test
of a while loop is not considered to be part of that loop. This makes
the rules consistent with #37360. The new loop scopes in typeck also
follow this rule. That means that `loop { while (break) {} }` now
terminates instead of looping forever. This is technically a breaking
change.~~
- ~~On that note, expressions like `while break {}` and `if break {}` no
longer parse because `{}` is interpreted as an expression argument to
`break`. But no code except compiler test cases should do that anyway
because it makes no sense.~~
- The RFC did not make it clear, but I chose to make `break ()` inside
of a `while` loop illegal, just in case we wanted to do anything with
that design space in the future.
This is my first time dealing with this part of rustc so I'm sure
there's plenty of problems to pick on here ^_^
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This implements RFC 1624, tracking issue #37339.
- `FnCtxt` (in typeck) gets a stack of `LoopCtxt`s, which store the
currently deduced type of that loop, the desired type, and a list of
break expressions currently seen. `loop` loops get a fresh type
variable as their initial type (this logic is stolen from that for
arrays). `while` loops get `()`.
- `break {expr}` looks up the broken loop, and unifies the type of
`expr` with the type of the loop.
- `break` with no expr unifies the loop's type with `()`.
- When building MIR, `loop` loops no longer construct a `()` value at
termination of the loop; rather, the `break` expression assigns the
result of the loop. `while` loops are unchanged.
- `break` respects contexts in which expressions may not end with braced
blocks. That is, `while break { break-value } { while-body }` is
illegal; this preserves backwards compatibility.
- The RFC did not make it clear, but I chose to make `break ()` inside
of a `while` loop illegal, just in case we wanted to do anything with
that design space in the future.
This is my first time dealing with this part of rustc so I'm sure
there's plenty of problems to pick on here ^_^
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Stabilize RFC 1560
Fixes #13598, fixes #23157, fixes #32303.
cc #35120
r? @nrc
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Update E0088 to new error format
Fixes #35226 which is part of #35233. Is based on #36208 from @yossi-k.
r? @jonathandturner
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For a given code:
```rust
vec![0.0].iter().map(|s| s as i16).collect::<Vec<i16>>();
```
display:
```nocode
error: casting `&f64` as `i16` is invalid
--> foo.rs:2:35
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2 | vec![0.0].iter().map(|s| s as i16).collect::<Vec<i16>>();
| - ^^^ cannot cast `&f64` as `i16`
| |
| did you mean `*s`?
```
instead of:
```nocode
error: casting `&f64` as `i16` is invalid
--> <anon>:2:30
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2 | vec![0.0].iter().map(|s| s as i16).collect();
| ^^^^^^^^
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= help: cast through a raw pointer first
```
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Separate impl items from the parent impl
This change separates impl item bodies out of the impl itself. This gives incremental more resolution. In so doing, it refactors how the visitors work, and cleans up a bit of the collect/check logic (mostly by moving things out of collect that didn't really belong there, because they were just checking conditions).
However, this is not as effective as I expected, for a kind of frustrating reason. In particular, when invoking `foo.bar()` you still wind up with dependencies on private items. The problem is that the method resolution code scans that list for methods with the name `bar` -- and this winds up touching *all* the methods, even private ones.
I can imagine two obvious ways to fix this:
- separating fn bodies from fn sigs (#35078, currently being pursued by @flodiebold)
- a more aggressive model of incremental that @michaelwoerister has been advocating, in which we hash the intermediate results (e.g., the outputs of collect) so that we can see that the intermediate result hasn't changed, even if a particular impl item has changed.
So all in all I'm not quite sure whether to land this or not. =) It still seems like it has to be a win in some cases, but not with the test cases we have just now. I can try to gin up some test cases, but I'm not sure if they will be totally realistic. On the other hand, some of the early refactorings to the visitor trait seem worthwhile to me regardless.
cc #36349 -- well, this is basically a fix for that issue, I guess
r? @michaelwoerister
NB: Based atop of @eddyb's PR https://github.com/rust-lang/rust/pull/37402; don't land until that lands.
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Improved error reporting when target sysroot is missing.
Attempts to resolve #37131.
This is my first pull request on rust, so I would greatly appreciate any feedback you have on this.
Thanks!
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Rollup of 8 pull requests
- Successful merges: #37752, #37757, #37759, #37766, #37772, #37799, #37806, #37821
- Failed merges: #37442
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Needed to keep coherence from freaking out.
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Add semicolon to "perhaps add a `use` for one of them" help
Similar to pull request #37430, this makes the message more copy-paste
friendly and aligns it with other messages like:
help: you can import it into scope: use foo::Bar;
r? @eddyb
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coherence: skip impls with an erroneous trait ref
Impls with a erroneous trait ref are already ignored in the first part
of coherence, so ignore them in the second part too. This avoids
cascading coherence errors when 1 impl of a trait has an error.
r? @nikomatsakis
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Support `use`ing externally defined macros behind `#![feature(use_extern_macros)]`
With `#![feature(use_extern_macros)]`,
- A name collision between macros from different upstream crates is much less of an issue since we can `use` the macros in different submodules or rename with `as`.
- We can reexport macros with `pub use`, so `#![feature(macro_reexport)]` is no longer needed.
- These reexports are allowed in any module, so crates can expose a macro-modular interface.
If a macro invocation can resolve to both a `use` import and a `macro_rules!` or `#[macro_use]`, it is an ambiguity error.
r? @nrc
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Improve reference cast help message
Fixes #37338.
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This commit is an implementation of [RFC 1721] which adds a new target feature
to the compiler, `crt-static`, which can be used to select how the C runtime for
a target is linked. Most targets dynamically linke the C runtime by default with
the notable exception of some of the musl targets.
[RFC 1721]: https://github.com/rust-lang/rfcs/blob/master/text/1721-crt-static.md
This commit first adds the new target-feature, `crt-static`. If enabled, then
the `cfg(target_feature = "crt-static")` will be available. Targets like musl
will have this enabled by default. This feature can be controlled through the
standard target-feature interface, `-C target-feature=+crt-static` or
`-C target-feature=-crt-static`.
Next this adds an gated and unstable `#[link(cfg(..))]` feature to enable the
`crt-static` semantics we want with libc. The exact behavior of this attribute
is a little squishy, but it's intended to be a forever-unstable
implementation detail of the liblibc crate.
Specifically the `#[link(cfg(..))]` annotation means that the `#[link]`
directive is only active in a compilation unit if that `cfg` value is satisfied.
For example when compiling an rlib, these directives are just encoded and
ignored for dylibs, and all staticlibs are continued to be put into the rlib as
usual. When placing that rlib into a staticlib, executable, or dylib, however,
the `cfg` is evaluated *as if it were defined in the final artifact* and the
library is decided to be linked or not.
Essentially, what'll happen is:
* On MSVC with `-C target-feature=-crt-static`, the `msvcrt.lib` library will be
linked to.
* On MSVC with `-C target-feature=+crt-static`, the `libcmt.lib` library will be
linked to.
* On musl with `-C target-feature=-crt-static`, the object files in liblibc.rlib
are removed and `-lc` is passed instead.
* On musl with `-C target-feature=+crt-static`, the object files in liblibc.rlib
are used and `-lc` is not passed.
This commit does **not** include an update to the liblibc module to implement
these changes. I plan to do that just after the 1.14.0 beta release is cut to
ensure we get ample time to test this feature.
cc #37406
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Similar to pull request #37430, this makes the message more copy-paste
friendly and aligns it with other messages like:
help: you can import it into scope: use foo::Bar;
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Impls with a erroneous trait ref are already ignored in the first part
of coherence, so ignore them in the second part too. This avoids
cascading coherence errors when 1 impl of a trait has an error.
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Fix invalid "ref mut mut" sugestion
Change output from:
```nocode
error: cannot borrow immutable local variable `x` as mutable
--> <anon>:12:23
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11 | TestEnum::Item(ref mut x) => {
| --------- use `ref mut mut x` here to make mutable
12 | test(&mut x);
| ^ cannot borrow mutably
```
to
```nocode
error: cannot borrow immutable local variable `x` as mutable
--> <anon>:12:23
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12 | test(&mut x);
| ^
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| cannot reborrow mutably
| try removing `&mut` here
```
Fixes #37139, #34337, #34126
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Improve "Doesn't live long enough" error
case with temporary variable
issue #36279 part of #35233
r? @jonathandturner
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r=alexcrichton
Add foreign formatting directive detection.
This teaches `format_args!` how to interpret format printf- and
shell-style format directives. This is used in cases where there are
unused formatting arguments, and the reason for that *might* be because
the programmer is trying to use the wrong kind of formatting string.
This was prompted by an issue encountered by simulacrum on the #rust IRC
channel. In short: although `println!` told them that they weren't using
all of the conversion arguments, the problem was in using printf-syle
directives rather than ones `println!` would undertand.
Where possible, `format_args!` will tell the programmer what they should
use instead. For example, it will suggest replacing `%05d` with `{:0>5}`,
or `%2$.*3$s` with `{1:.3$}`. Even if it cannot suggest a replacement,
it will explicitly note that Rust does not support that style of directive,
and direct the user to the `std::fmt` documentation.
-----
**Example**: given:
```rust
fn main() {
println!("%.*3$s %s!\n", "Hello,", "World", 4);
println!("%1$*2$.*3$f", 123.456);
}
```
The compiler outputs the following:
```text
error: multiple unused formatting arguments
--> local/fmt.rs:2:5
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2 | println!("%.*3$s %s!\n", "Hello,", "World", 4);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: argument never used
--> local/fmt.rs:2:30
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2 | println!("%.*3$s %s!\n", "Hello,", "World", 4);
| ^^^^^^^^
note: argument never used
--> local/fmt.rs:2:40
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2 | println!("%.*3$s %s!\n", "Hello,", "World", 4);
| ^^^^^^^
note: argument never used
--> local/fmt.rs:2:49
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2 | println!("%.*3$s %s!\n", "Hello,", "World", 4);
| ^
= help: `%.*3$s` should be written as `{:.2$}`
= help: `%s` should be written as `{}`
= note: printf formatting not supported; see the documentation for `std::fmt`
= note: this error originates in a macro outside of the current crate
error: argument never used
--> local/fmt.rs:6:29
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6 | println!("%1$*2$.*3$f", 123.456);
| ^^^^^^^
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= help: `%1$*2$.*3$f` should be written as `{0:1$.2$}`
= note: printf formatting not supported; see the documentation for `std::fmt`
```
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Don't provide hint to add lifetime on impl items
``` rust
use std::str::FromStr;
pub struct Foo<'a> {
field: &'a str,
}
impl<'a> FromStr for Foo<'a> {
type Err = ();
fn from_str(path: &str) -> Result<Self, ()> {
Ok(Foo { field: path })
}
}
```
would give the following hint:
``` nocode
help: consider using an explicit lifetime parameter as shown: fn from_str(path: &'a str) -> Result<Self, ()>
--> <anon>:9:5
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9 | fn from_str(path: &str) -> Result<Self, ()> {
| ^
```
which is never correct, since then there will be a lifetime mismatch between the `impl` and the trait.
Remove this hint for all `impl` items.
Re: #37363.
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Group unused import warnings per import list
Given a file
``` rust
use std::collections::{BinaryHeap, BTreeMap, BTreeSet};
fn main() {}
```
Show a single warning, instead of three for each unused import:
``` nocode
warning: unused imports, #[warn(unused_imports)] on by default
--> file2.rs:1:24
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1 | use std::collections::{BinaryHeap, BTreeMap, BTreeSet};
| ^^^^^^^^^^ ^^^^^^^^ ^^^^^^^^
```
Include support for lints pointing at `MultilineSpan`s, instead of just
`Span`s.
Fixes #16132.
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Show one error for duplicated type definitions
For the following code:
``` rustc
struct Bar;
struct Bar;
fn main () {
}
```
show
``` nocode
error[E0428]: a type named `Bar` has already been defined in this module
--> src/test/compile-fail/E0428.rs:12:1
|
11 | struct Bar;
| ----------- previous definition of `Bar` here
12 | struct Bar;
| ^^^^^^^^^^^
error: aborting due to previous error
```
instead of
``` nocode
error[E0428]: a type named `Bar` has already been defined in this module
--> src/test/compile-fail/E0428.rs:12:1
|
11 | struct Bar;
| ----------- previous definition of `Bar` here
12 | struct Bar;
| ^^^^^^^^^^^
error[E0428]: a value named `Bar` has already been defined in this module
--> src/test/compile-fail/E0428.rs:12:1
|
11 | struct Bar;
| ----------- previous definition of `Bar` here
12 | struct Bar;
| ^^^^^^^^^^^
error: aborting due to 2 previous errors
```
Fixes #35767.
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Make E0243/E0244 message consistent with E0107
E0243/E0233 prints `expected {}, found {}` on the span note, while E0107 prints it on the first line. This is confusing when both error occur simultaneously.
This PR makes E0243/E0233 print `expected {}, found {}` on the first line.
Code:
``` rust
struct Foo<'a, 'b> {
s: &'a str,
t: &'b str,
}
type Bar<T, U> = Foo<T, U>;
```
rustc output (before):
```
error[E0107]: wrong number of lifetime parameters: expected 2, found 0
--> test.rs:6:18
|
6 | type Bar<T, U> = Foo<T, U>;
| ^^^^^^^^^ expected 2 lifetime parameters
error[E0244]: wrong number of type arguments
--> test.rs:6:18
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6 | type Bar<T, U> = Foo<T, U>;
| ^^^^^^^^^ expected no type arguments, found 2
```
rustc output (after):
```
error[E0107]: wrong number of lifetime parameters: expected 2, found 0
--> /tmp/test.rs:6:18
|
6 | type Bar<T, U> = Foo<T, U>;
| ^^^^^^^^^ expected 2 lifetime parameters
error[E0244]: wrong number of type arguments: expected 0, found 2
--> /tmp/test.rs:6:18
|
6 | type Bar<T, U> = Foo<T, U>;
| ^^^^^^^^^ expected no type arguments
```
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This teaches `format_args!` how to interpret format printf- and
shell-style format directives. This is used in cases where there are
unused formatting arguments, and the reason for that *might* be because
the programmer is trying to use the wrong kind of formatting string.
This was prompted by an issue encountered by simulacrum on the #rust IRC
channel. In short: although `println!` told them that they weren't using
all of the conversion arguments, the problem was in using printf-syle
directives rather than ones `println!` would undertand.
Where possible, `format_args!` will tell the programmer what they should
use instead. For example, it will suggest replacing `%05d` with `{:0>5}`,
or `%2$.*3$s` with `{1:.3$}`. Even if it cannot suggest a replacement,
it will explicitly note that Rust does not support that style of directive,
and direct the user to the `std::fmt` documentation.
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Don't provide hint to add lifetime on impl items that implement a trait.
```rust
use std::str::FromStr;
pub struct Foo<'a> {
field: &'a str,
}
impl<'a> FromStr for Foo<'a> {
type Err = ();
fn from_str(path: &str) -> Result<Self, ()> {
Ok(Foo { field: path })
}
}
```
would give the following hint:
```nocode
help: consider using an explicit lifetime parameter as shown: fn from_str(path: &'a str) -> Result<Self, ()>
--> <anon>:9:5
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9 | fn from_str(path: &str) -> Result<Self, ()> {
| ^
```
which is never correct, since then there will be a lifetime mismatch
between the impl and the trait.
Remove this hint for impl items that implement a trait.
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