Add an impl Format for PanicInfo

defmt/src/impls/core_/mod.rs

@@ -12,6 +12,7 @@ mod cell;
 mod net;
 mod num;
 mod ops;
+mod panic;
 mod ptr;
 mod slice;
 

defmt/src/impls/core_/panic.rs

@@ -0,0 +1,26 @@
+use core::panic;
+
+use super::*;
+
+impl<'a> Format for panic::PanicInfo<'a> {
+ fn format(&self, f: Formatter) {
+ crate::write!(f, "panicked at {}:", self.location());
+ // TODO: consider supporting self.message() once stabilized, or add a crate feature for
+ // conditional support
+ if let Some(msg) = self.payload().downcast_ref::<&'static str>() {
+ crate::write!(f, "\n{=str}", msg);
+ }
+ }
+}
+
+impl<'a> Format for panic::Location<'a> {
+ fn format(&self, f: Formatter) {
+ crate::write!(
+ f,
+ "{=str}:{=u32}:{=u32}",
+ self.file(),
+ self.line(),
+ self.column()
+ );
+ }
+}