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#![no_main] #![no_std] extern crate cortex_m_rt; extern crate panic_semihosting; use cortex_m_rt::{entry, exception}; #[entry] fn foo() -> ! { loop {} } #[exception] //~ ERROR custom attribute panicked //~^ HELP `DefaultHandler` exception must have signature `fn(i16)` fn DefaultHandler(_irqn: i16) -> ! { loop {} }