address review feedback.

Author: pnkfelix

src/librustc_lint/builtin.rs

@@ -2182,11 +2182,12 @@ impl LintPass for DropWithReprExtern {
                                                                      codemap::DUMMY_SP);
                         ctx.span_lint(DROP_WITH_REPR_EXTERN,
                                       drop_impl_span,
-                                      "Structs with `#[repr(C)]` attribute that \
-                                       implement Drop have extra hidden state");
+                                      "implementing Drop adds hidden state to \
+                                       types, possibly conflicting with \
+                                       the `#[repr(C)]` attribute");
                         ctx.span_lint(DROP_WITH_REPR_EXTERN,
                                       self_defn_span,
-                                      "The `#[repr(C)]` attribute is attached here");
+                                      "the `#[repr(C)]` attribute is attached here");
                     }
                 }
                 _ => {}