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`#[cmse_nonsecure_entry]` is only valid for targets with the TrustZone-M
extension.
Erroneous code example:
```compile_fail,E0775
#![feature(cmse_nonsecure_entry)]
#[cmse_nonsecure_entry]
pub extern "C" fn entry_function() {}
```
To fix this error, compile your code for a Rust target that supports the
TrustZone-M extension. The current possible targets are:
* `thumbv8m.main-none-eabi`
* `thumbv8m.main-none-eabihf`
* `thumbv8m.base-none-eabi`
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