E0432: rust 2018 -> rust 2018 or later in --explain message

compiler/rustc_error_codes/src/error_codes/E0432.md

@@ -10,10 +10,10 @@ In Rust 2015, paths in `use` statements are relative to the crate root. To
 import items relative to the current and parent modules, use the `self::` and
 `super::` prefixes, respectively.
 
-In Rust 2018, paths in `use` statements are relative to the current module
-unless they begin with the name of a crate or a literal `crate::`, in which
-case they start from the crate root. As in Rust 2015 code, the `self::` and
-`super::` prefixes refer to the current and parent modules respectively.
+In Rust 2018 or later, paths in `use` statements are relative to the current
+module unless they begin with the name of a crate or a literal `crate::`, in
+which case they start from the crate root. As in Rust 2015 code, the `self::`
+and `super::` prefixes refer to the current and parent modules respectively.
 
 Also verify that you didn't misspell the import name and that the import exists
 in the module from where you tried to import it. Example:
@@ -38,8 +38,8 @@ use core::any;
 # fn main() {}
 ```
 
-In Rust 2018 the `extern crate` declaration is not required and you can instead
-just `use` it:
+Since Rust 2018 the `extern crate` declaration is not required and
+you can instead just `use` it:
 
 ```edition2018
 use core::any; // No extern crate required in Rust 2018.