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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`