Removed lintining on never type.
Abstracted repeating strings into statics.
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@ -42,6 +42,9 @@ declare_clippy_lint! {
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declare_lint_pass!(ImplicitReturn => [IMPLICIT_RETURN]);
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static LINT_BREAK: &str = "change `break` to `return` as shown";
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static LINT_RETURN: &str = "add `return` as shown";
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fn lint(cx: &LateContext<'_, '_>, outer_span: Span, inner_span: Span, msg: &str) {
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let outer_span = span_to_outer_expn(outer_span);
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let inner_span = span_to_outer_expn(inner_span);
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@ -66,12 +69,12 @@ fn span_to_outer_expn(span: Span) -> Span {
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}
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}
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fn expr_match(cx: &LateContext<'_, '_>, expr: &Expr, ret_ty_is_never: bool) {
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fn expr_match(cx: &LateContext<'_, '_>, expr: &Expr) {
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match &expr.node {
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// loops could be using `break` instead of `return`
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ExprKind::Block(block, ..) | ExprKind::Loop(block, ..) => {
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if let Some(expr) = &block.expr {
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expr_match(cx, expr, ret_ty_is_never);
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expr_match(cx, expr);
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}
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// only needed in the case of `break` with `;` at the end
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else if let Some(stmt) = block.stmts.last() {
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@ -81,7 +84,7 @@ fn expr_match(cx: &LateContext<'_, '_>, expr: &Expr, ret_ty_is_never: bool) {
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if let ExprKind::Break(.., break_expr) = &expr.node;
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if let Some(break_expr) = break_expr;
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then {
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lint(cx, expr.span, break_expr.span, "change `break` to `return` as shown");
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lint(cx, expr.span, break_expr.span, LINT_BREAK);
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}
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}
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}
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@ -89,7 +92,7 @@ fn expr_match(cx: &LateContext<'_, '_>, expr: &Expr, ret_ty_is_never: bool) {
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// use `return` instead of `break`
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ExprKind::Break(.., break_expr) => {
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if let Some(break_expr) = break_expr {
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lint(cx, expr.span, break_expr.span, "change `break` to `return` as shown");
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lint(cx, expr.span, break_expr.span, LINT_BREAK);
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}
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},
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ExprKind::Match(.., arms, source) => {
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@ -102,38 +105,29 @@ fn expr_match(cx: &LateContext<'_, '_>, expr: &Expr, ret_ty_is_never: bool) {
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if check_all_arms {
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for arm in arms {
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expr_match(cx, &arm.body, ret_ty_is_never);
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expr_match(cx, &arm.body);
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}
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} else {
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expr_match(
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cx,
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&arms.first().expect("if let doesn't have a single arm").body,
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ret_ty_is_never,
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);
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expr_match(cx, &arms.first().expect("if let doesn't have a single arm").body);
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}
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},
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// skip if it already has a return statement
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ExprKind::Ret(..) => (),
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// make sure it's not a call that panics unless we intend to return a panic
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// make sure it's not a call that panics
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ExprKind::Call(expr, ..) => {
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if_chain! {
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if let ExprKind::Path(qpath) = &expr.node;
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if let Some(path_def_id) = resolve_node(cx, qpath, expr.hir_id).opt_def_id();
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if match_def_path(cx, path_def_id, &BEGIN_PANIC) ||
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match_def_path(cx, path_def_id, &BEGIN_PANIC_FMT);
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then {
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// only put `return` on panics if the return type of the function/closure is a panic
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if ret_ty_is_never {
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lint(cx, expr.span, expr.span, "add `return` as shown")
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}
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}
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then { }
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else {
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lint(cx, expr.span, expr.span, "add `return` as shown")
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lint(cx, expr.span, expr.span, LINT_RETURN)
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}
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}
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},
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// everything else is missing `return`
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_ => lint(cx, expr.span, expr.span, "add `return` as shown"),
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_ => lint(cx, expr.span, expr.span, LINT_RETURN),
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}
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}
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@ -149,12 +143,11 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ImplicitReturn {
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) {
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let def_id = cx.tcx.hir().body_owner_def_id(body.id());
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let mir = cx.tcx.optimized_mir(def_id);
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let ret_ty = mir.return_ty();
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// checking return type through MIR, HIR is not able to determine inferred closure return types
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// make sure it's not a macro
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if !ret_ty.is_unit() && !in_macro_or_desugar(span) {
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expr_match(cx, &body.value, ret_ty.is_never());
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if !mir.return_ty().is_unit() && !in_macro_or_desugar(span) {
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expr_match(cx, &body.value);
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}
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}
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}
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@ -77,10 +77,6 @@ fn test_closure() {
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let _ = || true;
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}
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fn test_return_never() -> ! {
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panic!()
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}
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fn test_panic() -> bool {
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panic!()
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}
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@ -61,16 +61,10 @@ LL | let _ = || true;
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| ^^^^ help: add `return` as shown: `return true`
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error: missing return statement
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--> $DIR/implicit_return.rs:81:5
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LL | panic!()
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| ^^^^^^^^ help: add `return` as shown: `return panic!()`
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error: missing return statement
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--> $DIR/implicit_return.rs:89:5
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--> $DIR/implicit_return.rs:85:5
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LL | format!("test {}", "test")
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add `return` as shown: `return format!("test {}", "test")`
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error: aborting due to 12 previous errors
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error: aborting due to 11 previous errors
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