//! lint when items are used after statements
-use crate::utils::{in_macro, span_lint};
-use matches::matches;
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::utils::span_lint;
+use rustc_ast::ast::{Block, ItemKind, StmtKind};
+use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
-/// **What it does:** Checks for items declared after some statement in a block.
-///
-/// **Why is this bad?** Items live for the entire scope they are declared
-/// in. But statements are processed in order. This might cause confusion as
-/// it's hard to figure out which item is meant in a statement.
-///
-/// **Known problems:** None.
-///
-/// **Example:**
-/// ```rust
-/// fn foo() {
-/// println!("cake");
-/// }
-///
-/// fn main() {
-/// foo(); // prints "foo"
-/// fn foo() {
-/// println!("foo");
-/// }
-/// foo(); // prints "foo"
-/// }
-/// ```
declare_clippy_lint! {
+ /// **What it does:** Checks for items declared after some statement in a block.
+ ///
+ /// **Why is this bad?** Items live for the entire scope they are declared
+ /// in. But statements are processed in order. This might cause confusion as
+ /// it's hard to figure out which item is meant in a statement.
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ```rust
+ /// // Bad
+ /// fn foo() {
+ /// println!("cake");
+ /// }
+ ///
+ /// fn main() {
+ /// foo(); // prints "foo"
+ /// fn foo() {
+ /// println!("foo");
+ /// }
+ /// foo(); // prints "foo"
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// // Good
+ /// fn foo() {
+ /// println!("cake");
+ /// }
+ ///
+ /// fn main() {
+ /// fn foo() {
+ /// println!("foo");
+ /// }
+ /// foo(); // prints "foo"
+ /// foo(); // prints "foo"
+ /// }
+ /// ```
pub ITEMS_AFTER_STATEMENTS,
pedantic,
"blocks where an item comes after a statement"
}
-pub struct ItemsAfterStatements;
-
-impl LintPass for ItemsAfterStatements {
- fn get_lints(&self) -> LintArray {
- lint_array!(ITEMS_AFTER_STATEMENTS)
- }
-}
+declare_lint_pass!(ItemsAfterStatements => [ITEMS_AFTER_STATEMENTS]);
impl EarlyLintPass for ItemsAfterStatements {
fn check_block(&mut self, cx: &EarlyContext<'_>, item: &Block) {
- if in_macro(item.span) {
+ if in_external_macro(cx.sess(), item.span) {
return;
}
- // skip initial items
+ // skip initial items and trailing semicolons
let stmts = item
.stmts
.iter()
- .map(|stmt| &stmt.node)
- .skip_while(|s| matches!(**s, StmtKind::Item(..)));
+ .map(|stmt| &stmt.kind)
+ .skip_while(|s| matches!(**s, StmtKind::Item(..) | StmtKind::Empty));
// lint on all further items
for stmt in stmts {
if let StmtKind::Item(ref it) = *stmt {
- if in_macro(it.span) {
+ if in_external_macro(cx.sess(), it.span) {
return;
}
- if let ItemKind::MacroDef(..) = it.node {
+ if let ItemKind::MacroDef(..) = it.kind {
// do not lint `macro_rules`, but continue processing further statements
continue;
}