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This calling convention is used to define interrup handlers on MSP430
microcontrollers. Usage looks like this:
``` rust
#[no_mangle]
#[link_section = "__interrupt_vector_10"]
pub static TIM0_VECTOR: unsafe extern "msp430-interrupt" fn() = tim0;
unsafe extern "msp430-interrupt" fn tim0() {
P1OUT.write(0x00);
}
```
which generates the following assembly:
``` asm
Disassembly of section __interrupt_vector_10:
0000fff2 <TIM0_VECTOR>:
fff2: 10 c0 interrupt service routine at 0xc010
Disassembly of section .text:
0000c010 <_ZN3msp4tim017h3193b957fd6a4fd4E>:
c010: c2 43 21 00 mov.b #0, &0x0021 ;r3 As==00
c014: 00 13 reti
...
```
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Given the following code:
```rust
struct Foo<T: Clone>(T);
use std::ops::Add;
impl<T: Clone, Add> Add for Foo<T> {
type Output = usize;
fn add(self, rhs: Self) -> Self::Output {
unimplemented!();
}
}
```
present the following output:
```nocode
error[E0404]: `Add` is not a trait
--> file3.rs:5:21
|
5 | impl<T: Clone, Add> Add for Okok<T> {
| --- ^^^ expected trait, found type parameter
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| type parameter defined here
```
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in non-codegen tests. Remove false positive in a test that relied on the exact formatting of an error string and rewrite the sysv64 register allocation test at it was triggering undefined behaviour
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