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Auto merge of #31656 - jonas-schievink:mirdump, r=nrc
This allows obtaining a textual MIR dump for individual items or all items in the crate.
I haven't added any tests since ~~I'm too lazy~~ this is an unstable debugging option, but I'll add one if required.
MIR for a single function can now be dumped using `rustc -Zunstable-options --unpretty mir=my_function` and no longer requires the use of in-source `#[rustc_mir]` attributes.
Blocks rust-lang/rust-playpen#154 (if MIR dump support from the playpen is even wanted).
Example output:
```rust
fn main() {
let x = Some(0);
x.unwrap_or_else(|| 1);
}
```
```
MIR for expr || 1 (id=16)
fn(arg0: [[email protected]:3:22: 3:26]) -> i32 {
let mut tmp0: ();
bb0: {
return = const 1;
goto -> bb1;
}
bb1: {
return;
}
}
MIR for fn main::main (id=4)
fn() -> () {
let var0: core::option::Option<i32>; // x
let mut tmp0: ();
let mut tmp1: i32;
let mut tmp2: core::option::Option<i32>;
let mut tmp3: [[email protected]:3:22: 3:26];
bb0: {
var0 = core::option::Option::Some(const 0);
tmp2 = var0;
tmp3 = [[email protected]:3:22: 3:26];
tmp1 = core::option::Option<T>::unwrap_or_else(tmp2, tmp3) -> bb2;
}
bb1: {
return;
}
bb2: {
drop(tmp1) -> bb3;
}
bb3: {
return = ();
goto -> bb1;
}
}
```
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