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Merge `feature(advanced_slice_patterns)` into `feature(slice_patterns)`
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Conflicts:
src/test/run-pass/issue-13027.rs
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Until some backwards-compatibility hazards are fixed in #23121,
these need to be unstable.
[breaking-change]
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Now that support has been removed, all lingering use cases are renamed.
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Now that features must be declared expanded source often does not compile.
This adds 'pretty-expanded' to a bunch of test cases that still work.
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here. Some of this may have been poorly rebased, though I tried to be
careful and preserve the spirit of the test.
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This breaks code that referred to variant names in the same namespace as
their enum. Reexport the variants in the old location or alter code to
refer to the new locations:
```
pub enum Foo {
A,
B
}
fn main() {
let a = A;
}
```
=>
```
pub use self::Foo::{A, B};
pub enum Foo {
A,
B
}
fn main() {
let a = A;
}
```
or
```
pub enum Foo {
A,
B
}
fn main() {
let a = Foo::A;
}
```
[breaking-change]
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This lets the parser understand trailing commas in method calls, method
definitions, enum variants, and type parameters.
Closes #14240.
Closes #15887.
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floating point numbers for real.
This will break code that looks like:
let mut x = 0;
while ... {
x += 1;
}
println!("{}", x);
Change that code to:
let mut x = 0i;
while ... {
x += 1;
}
println!("{}", x);
Closes #15201.
[breaking-change]
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