Don't use core::error::Error

Author: dhardy

rand_core/src/os.rs

@@ -60,7 +60,7 @@ impl core::fmt::Display for OsError {
 
 // NOTE: this should not require std; see getrandom#545
 #[cfg(feature = "std")]
-impl core::error::Error for OsError {
+impl std::error::Error for OsError {
     #[inline]
     fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
         core::error::Error::source(&self.0)