Rollup merge of #58242 - notriddle:patch-3, r=zackmdavis

Document the one TyKind that isn't documented This is especially confusing since the name `Foreign` and the name `extern type` are so different. I deduced that they're the same by consulting git-blame.
rust-lang · Feb 7, 2019 · 000daf9 · 000daf9
2 parents 5489d0d + 5db3850
commit 000daf9
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/librustc/ty/sty.rs b/src/librustc/ty/sty.rs
@@ -107,6 +107,7 @@ pub enum TyKind<'tcx> {
     /// definition and not a concrete use of it.
     Adt(&'tcx AdtDef, &'tcx Substs<'tcx>),
 
+    /// An unsized FFI type that is opaque to Rust. Written as `extern type T`.
     Foreign(DefId),
 
     /// The pointee of a string slice. Written as `str`.