Make empty-line-after an early clippy lint

compiler/rustc_lint/src/early.rs

@@ -246,6 +246,14 @@ impl<'ast, 'ecx, 'tcx, T: EarlyLintPass> ast_visit::Visitor<'ast>
                 }
             }
             ast_visit::walk_assoc_item(cx, item, ctxt);
+            match ctxt {
+                ast_visit::AssocCtxt::Trait => {
+                    lint_callback!(cx, check_trait_item_post, item);
+                }
+                ast_visit::AssocCtxt::Impl => {
+                    lint_callback!(cx, check_impl_item_post, item);
+                }
+            }
         });
     }
 

compiler/rustc_lint/src/passes.rs

@@ -162,7 +162,9 @@ macro_rules! early_lint_methods {
                 c: rustc_span::Span,
                 d_: rustc_ast::NodeId);
             fn check_trait_item(a: &rustc_ast::AssocItem);
+            fn check_trait_item_post(a: &rustc_ast::AssocItem);
             fn check_impl_item(a: &rustc_ast::AssocItem);
+            fn check_impl_item_post(a: &rustc_ast::AssocItem);
             fn check_variant(a: &rustc_ast::Variant);
             fn check_attribute(a: &rustc_ast::Attribute);
             fn check_attributes(a: &[rustc_ast::Attribute]);

src/tools/clippy/clippy_lints/src/declared_lints.rs

@@ -144,8 +144,6 @@ pub static LINTS: &[&crate::LintInfo] = &[
     crate::doc::DOC_NESTED_REFDEFS_INFO,
     crate::doc::DOC_OVERINDENTED_LIST_ITEMS_INFO,
     crate::doc::EMPTY_DOCS_INFO,
-    crate::doc::EMPTY_LINE_AFTER_DOC_COMMENTS_INFO,
-    crate::doc::EMPTY_LINE_AFTER_OUTER_ATTR_INFO,
     crate::doc::MISSING_ERRORS_DOC_INFO,
     crate::doc::MISSING_PANICS_DOC_INFO,
     crate::doc::MISSING_SAFETY_DOC_INFO,
@@ -162,6 +160,8 @@ pub static LINTS: &[&crate::LintInfo] = &[
     crate::else_if_without_else::ELSE_IF_WITHOUT_ELSE_INFO,
     crate::empty_drop::EMPTY_DROP_INFO,
     crate::empty_enum::EMPTY_ENUM_INFO,
+    crate::empty_line_after::EMPTY_LINE_AFTER_DOC_COMMENTS_INFO,
+    crate::empty_line_after::EMPTY_LINE_AFTER_OUTER_ATTR_INFO,
     crate::empty_with_brackets::EMPTY_ENUM_VARIANTS_WITH_BRACKETS_INFO,
     crate::empty_with_brackets::EMPTY_STRUCTS_WITH_BRACKETS_INFO,
     crate::endian_bytes::BIG_ENDIAN_BYTES_INFO,