Add Span::def_site-the-API

Author: alexcrichton

src/lib.rs

@@ -106,16 +106,21 @@ impl TokenStream {
 #[derive(Copy, Clone)]
 pub struct Span(imp::Span);
 
+#[doc(hidden)]
 impl Default for Span {
     fn default() -> Span {
-        Span(imp::Span::default())
+        Span(imp::Span::def_site())
     }
 }
 
 impl Span {
     pub fn call_site() -> Span {
         Span(imp::Span::call_site())
     }
+
+    pub fn def_site() -> Span {
+        Span(imp::Span::def_site())
+    }
 }
 
 #[derive(Clone, Debug)]

src/stable.rs

@@ -137,13 +137,17 @@ impl IntoIterator for TokenStream {
     }
 }
 
-#[derive(Clone, Copy, Default, Debug)]
+#[derive(Clone, Copy, Debug)]
 pub struct Span;
 
 impl Span {
     pub fn call_site() -> Span {
         Span
     }
+
+    pub fn def_site() -> Span {
+        Span
+    }
 }
 
 #[derive(Copy, Clone)]

src/unstable.rs

@@ -166,10 +166,8 @@ impl Span {
     pub fn call_site() -> Span {
         Span(proc_macro::Span::call_site())
     }
-}
 
-impl Default for Span {
-    fn default() -> Span {
+    pub fn def_site() -> Span {
         Span(proc_macro::Span::def_site())
     }
 }