Remove is_import field

src/librustc/hir/def.rs

@@ -134,9 +134,6 @@ pub struct Export {
     /// The visibility of the export.
     /// We include non-`pub` exports for hygienic macros that get used from extern crates.
     pub vis: ty::Visibility,
-    /// True if from a `use` or and `extern crate`.
-    /// Used in rustdoc.
-    pub is_import: bool,
 }
 
 impl CtorKind {

src/librustc/ich/impls_hir.rs

@@ -1115,8 +1115,7 @@ impl_stable_hash_for!(struct hir::def::Export {
     ident,
     def,
     vis,
-    span,
-    is_import
+    span
 });
 
 impl<'a> HashStable<StableHashingContext<'a>>