Delete no_hygiene config for rustc older than 1.45

Author: dtolnay

build.rs

@@ -58,10 +58,6 @@ fn main() {
         println!("cargo:rustc-cfg=span_locations");
     }
 
-    if version.minor < 45 {
-        println!("cargo:rustc-cfg=no_hygiene");
-    }
-
     if version.minor < 47 {
         println!("cargo:rustc-cfg=no_ident_new_raw");
     }

src/fallback.rs

@@ -463,7 +463,6 @@ impl Span {
         Span { lo: 0, hi: 0 }
     }
 
-    #[cfg(not(no_hygiene))]
     pub fn mixed_site() -> Self {
         Span::call_site()
     }

src/lib.rs

@@ -400,9 +400,6 @@ impl Span {
     /// The span located at the invocation of the procedural macro, but with
     /// local variables, labels, and `$crate` resolved at the definition site
     /// of the macro. This is the same hygiene behavior as `macro_rules`.
-    ///
-    /// This function requires Rust 1.45 or later.
-    #[cfg(not(no_hygiene))]
     pub fn mixed_site() -> Self {
         Span::_new(imp::Span::mixed_site())
     }

src/wrapper.rs

@@ -397,7 +397,6 @@ impl Span {
         }
     }
 
-    #[cfg(not(no_hygiene))]
     pub fn mixed_site() -> Self {
         if inside_proc_macro() {
             Span::Compiler(proc_macro::Span::mixed_site())
@@ -417,27 +416,15 @@ impl Span {
 
     pub fn resolved_at(&self, other: Span) -> Span {
         match (self, other) {
-            #[cfg(not(no_hygiene))]
             (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.resolved_at(b)),
-
-            // Name resolution affects semantics, but location is only cosmetic
-            #[cfg(no_hygiene)]
-            (Span::Compiler(_), Span::Compiler(_)) => other,
-
             (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.resolved_at(b)),
             _ => mismatch(),
         }
     }
 
     pub fn located_at(&self, other: Span) -> Span {
         match (self, other) {
-            #[cfg(not(no_hygiene))]
             (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.located_at(b)),
-
-            // Name resolution affects semantics, but location is only cosmetic
-            #[cfg(no_hygiene)]
-            (Span::Compiler(_), Span::Compiler(_)) => *self,
-
             (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.located_at(b)),
             _ => mismatch(),
         }