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format payload if possible instead of returning "Box<Any>"

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This commit is contained in:
Jorge Aparicio 2018-05-01 03:02:39 +02:00
parent 63f18e108a
commit eaef110890
1 changed files with 11 additions and 4 deletions
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15
src/libstd/panicking.rs
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@ -440,12 +440,11 @@ fn continue_panic_fmt(info: &PanicInfo) -> ! {
PanicPayload { payload, msg, string: None }
}
fn fill(&mut self) -> Option<&mut String> {
if let Some(msg) = self.msg.take() {
if let Some(msg) = self.msg.cloned() {
Some(self.string.get_or_insert_with(|| {
let mut s = String::new();
drop(s.write_fmt(*msg));
drop(s.write_fmt(msg));
s
}))
} else {
@ -459,6 +458,10 @@ fn continue_panic_fmt(info: &PanicInfo) -> ! {
if let Some(string) = self.fill() {
let contents = mem::replace(string, String::new());
Box::into_raw(Box::new(contents))
} else if let Some(s) = self.payload.downcast_ref::<&str>() {
Box::into_raw(Box::new(s.to_owned()))
} else if let Some(s) = self.payload.downcast_ref::<String>() {
Box::into_raw(Box::new(s.clone()))
} else {
// We can't go from &(Any+Send) to Box<Any+Send> so the payload is lost here
struct NoPayload;
@ -467,7 +470,11 @@ fn continue_panic_fmt(info: &PanicInfo) -> ! {
}
fn get(&mut self) -> &(Any + Send) {
self.payload
if let Some(s) = self.fill() {
s
} else {
self.payload
}
}
}
}