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e5a639dbd0
Tweak incorrect ABI suggestion and make suggestion verbose
Provide a better suggestion message, and make the suggestion verbose.
```
error[E0703]: invalid ABI: found `riscv-interrupt`
--> $DIR/riscv-discoverability-guidance.rs:17:8
|
LL | extern "riscv-interrupt" fn isr() {}
| ^^^^^^^^^^^^^^^^^ invalid ABI
|
= note: invoke `rustc --print=calling-conventions` for a full list of supported calling conventions
help: there's a similarly named valid ABI `riscv-interrupt-m`
|
LL | extern "riscv-interrupt-m" fn isr() {}
| ++
```