Delete no_lexerror_display config for rustc older than 1.44

Author: dtolnay

build.rs

@@ -58,10 +58,6 @@ fn main() {
         println!("cargo:rustc-cfg=span_locations");
     }
 
-    if version.minor < 44 {
-        println!("cargo:rustc-cfg=no_lexerror_display");
-    }
-
     if version.minor < 45 {
         println!("cargo:rustc-cfg=no_hygiene");
     }

src/wrapper.rs

@@ -285,15 +285,7 @@ impl Debug for LexError {
 impl Display for LexError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
-            #[cfg(not(no_lexerror_display))]
             LexError::Compiler(e) => Display::fmt(e, f),
-            #[cfg(no_lexerror_display)]
-            LexError::Compiler(_e) => Display::fmt(
-                &fallback::LexError {
-                    span: fallback::Span::call_site(),
-                },
-                f,
-            ),
             LexError::Fallback(e) => Display::fmt(e, f),
         }
     }