move error.rs to error/mod.rs

Author: Ariel Ben-Yehuda

library/core/src/error.rs library/core/src/error/mod.rslibrary/core/src/error.rs renamed to library/core/src/error/mod.rs

@@ -10,7 +10,7 @@ help: the trait `std::fmt::Display` is not implemented for `MyError`
 3 | struct MyError;
   | ^^^^^^^^^^^^^^
 note: required by a bound in `std::error::Error`
- --> $SRC_DIR/core/src/error.rs:LL:COL
+ --> $SRC_DIR/core/src/error/mod.rs:LL:COL
 
 error[E0277]: `MyError` doesn't implement `Debug`
  --> $DIR/issue-71363.rs:4:28
@@ -20,7 +20,7 @@ error[E0277]: `MyError` doesn't implement `Debug`
   |
   = note: add `#[derive(Debug)]` to `MyError` or manually `impl Debug for MyError`
 note: required by a bound in `std::error::Error`
- --> $SRC_DIR/core/src/error.rs:LL:COL
+ --> $SRC_DIR/core/src/error/mod.rs:LL:COL
 help: consider annotating `MyError` with `#[derive(Debug)]`
   |
 3 + #[derive(Debug)]