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#![no_main] #![no_std] extern crate cortex_m_rt; extern crate panic_halt; use cortex_m_rt::{entry, exception}; #[entry] fn foo() -> ! { loop {} } #[exception] unsafe fn DefaultHandler(_irqn: i16) {} pub mod reachable { use cortex_m_rt::exception; #[exception] //~ ERROR symbol `DefaultHandler` is already defined unsafe fn DefaultHandler(_irqn: i16) {} }