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https://github.com/rust-lang/rust-clippy
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Auto merge of #7004 - Jarcho:manual_map_if_then_else, r=camsteffen
Fix `manual_map` at the end of an if chain changelog: Fix `manual_map` suggestion at the end of an if chain
This commit is contained in:
bors
commit
44bf60f62d
5 changed files with 61 additions and 38 deletions
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@ -2,7 +2,7 @@ use crate::{map_unit_fn::OPTION_MAP_UNIT_FN, matches::MATCH_AS_REF};
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
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use clippy_utils::ty::{can_partially_move_ty, is_type_diagnostic_item, peel_mid_ty_refs_is_mutable};
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use clippy_utils::{is_allowed, is_else_clause_of_if_let_else, match_def_path, match_var, paths, peel_hir_expr_refs};
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use clippy_utils::{is_allowed, is_else_clause, match_def_path, match_var, paths, peel_hir_expr_refs};
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use rustc_ast::util::parser::PREC_POSTFIX;
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use rustc_errors::Applicability;
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use rustc_hir::{
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@ -181,8 +181,7 @@ impl LateLintPass<'_> for ManualMap {
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expr.span,
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"manual implementation of `Option::map`",
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"try this",
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if matches!(match_kind, MatchSource::IfLetDesugar { .. }) && is_else_clause_of_if_let_else(cx.tcx, expr)
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{
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if matches!(match_kind, MatchSource::IfLetDesugar { .. }) && is_else_clause(cx.tcx, expr) {
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format!("{{ {}{}.map({}) }}", scrutinee_str, as_ref_str, body_str)
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} else {
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format!("{}{}.map({})", scrutinee_str, as_ref_str, body_str)
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@ -797,22 +797,29 @@ pub fn get_parent_as_impl(tcx: TyCtxt<'_>, id: HirId) -> Option<&Impl<'_>> {
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}
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}
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/// Checks if the given expression is the else clause in the expression `if let .. {} else {}`
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pub fn is_else_clause_of_if_let_else(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
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/// Checks if the given expression is the else clause of either an `if` or `if let` expression.
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pub fn is_else_clause(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
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let map = tcx.hir();
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let mut iter = map.parent_iter(expr.hir_id);
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let arm_id = match iter.next() {
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Some((id, Node::Arm(..))) => id,
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_ => return false,
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};
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match iter.next() {
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Some((arm_id, Node::Arm(..))) => matches!(
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iter.next(),
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Some((
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_,
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Node::Expr(Expr {
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kind: ExprKind::Match(_, [_, else_arm], MatchSource::IfLetDesugar { .. }),
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..
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})
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))
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if else_arm.hir_id == arm_id
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),
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Some((
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_,
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Node::Expr(Expr {
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kind: ExprKind::Match(_, [_, else_arm], kind),
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kind: ExprKind::If(_, _, Some(else_expr)),
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..
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}),
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)) => else_arm.hir_id == arm_id && matches!(kind, MatchSource::IfLetDesugar { .. }),
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)) => else_expr.hir_id == expr.hir_id,
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_ => false,
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}
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}
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@ -7,6 +7,7 @@
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clippy::map_identity,
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clippy::unit_arg,
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clippy::match_ref_pats,
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clippy::redundant_pattern_matching,
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dead_code
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)]
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@ -130,7 +131,11 @@ fn main() {
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}
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// #6847
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if Some(0).is_some() {
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if let Some(_) = Some(0) {
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Some(0)
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} else { Some(0).map(|x| x + 1) };
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if true {
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Some(0)
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} else { Some(0).map(|x| x + 1) };
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}
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@ -7,6 +7,7 @@
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clippy::map_identity,
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clippy::unit_arg,
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clippy::match_ref_pats,
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clippy::redundant_pattern_matching,
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dead_code
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)]
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@ -195,4 +196,12 @@ fn main() {
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} else {
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None
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};
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if true {
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Some(0)
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} else if let Some(x) = Some(0) {
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Some(x + 1)
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} else {
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None
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};
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}
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@ -1,5 +1,5 @@
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:14:5
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--> $DIR/manual_map_option.rs:15:5
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LL | / match Some(0) {
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LL | | Some(_) => Some(2),
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@ -10,7 +10,7 @@ LL | | };
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= note: `-D clippy::manual-map` implied by `-D warnings`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:19:5
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--> $DIR/manual_map_option.rs:20:5
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LL | / match Some(0) {
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LL | | Some(x) => Some(x + 1),
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@ -19,7 +19,7 @@ LL | | };
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| |_____^ help: try this: `Some(0).map(|x| x + 1)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:24:5
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--> $DIR/manual_map_option.rs:25:5
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LL | / match Some("") {
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LL | | Some(x) => Some(x.is_empty()),
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@ -28,7 +28,7 @@ LL | | };
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| |_____^ help: try this: `Some("").map(|x| x.is_empty())`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:29:5
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--> $DIR/manual_map_option.rs:30:5
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LL | / if let Some(x) = Some(0) {
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LL | | Some(!x)
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@ -38,7 +38,7 @@ LL | | };
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| |_____^ help: try this: `Some(0).map(|x| !x)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:36:5
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--> $DIR/manual_map_option.rs:37:5
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LL | / match Some(0) {
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LL | | Some(x) => { Some(std::convert::identity(x)) }
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@ -47,7 +47,7 @@ LL | | };
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| |_____^ help: try this: `Some(0).map(std::convert::identity)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:41:5
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--> $DIR/manual_map_option.rs:42:5
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LL | / match Some(&String::new()) {
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LL | | Some(x) => Some(str::len(x)),
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@ -56,7 +56,7 @@ LL | | };
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| |_____^ help: try this: `Some(&String::new()).map(|x| str::len(x))`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:51:5
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--> $DIR/manual_map_option.rs:52:5
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LL | / match &Some([0, 1]) {
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LL | | Some(x) => Some(x[0]),
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@ -65,7 +65,7 @@ LL | | };
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| |_____^ help: try this: `Some([0, 1]).as_ref().map(|x| x[0])`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:56:5
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--> $DIR/manual_map_option.rs:57:5
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LL | / match &Some(0) {
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LL | | &Some(x) => Some(x * 2),
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@ -74,7 +74,7 @@ LL | | };
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| |_____^ help: try this: `Some(0).map(|x| x * 2)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:61:5
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--> $DIR/manual_map_option.rs:62:5
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LL | / match Some(String::new()) {
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LL | | Some(ref x) => Some(x.is_empty()),
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@ -83,7 +83,7 @@ LL | | };
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| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.is_empty())`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:66:5
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--> $DIR/manual_map_option.rs:67:5
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LL | / match &&Some(String::new()) {
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LL | | Some(x) => Some(x.len()),
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@ -92,7 +92,7 @@ LL | | };
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| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.len())`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:71:5
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--> $DIR/manual_map_option.rs:72:5
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LL | / match &&Some(0) {
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LL | | &&Some(x) => Some(x + x),
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@ -101,7 +101,7 @@ LL | | };
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| |_____^ help: try this: `Some(0).map(|x| x + x)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:84:9
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--> $DIR/manual_map_option.rs:85:9
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LL | / match &mut Some(String::new()) {
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LL | | Some(x) => Some(x.push_str("")),
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@ -110,7 +110,7 @@ LL | | };
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| |_________^ help: try this: `Some(String::new()).as_mut().map(|x| x.push_str(""))`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:90:5
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--> $DIR/manual_map_option.rs:91:5
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LL | / match &mut Some(String::new()) {
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LL | | Some(ref x) => Some(x.len()),
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@ -119,7 +119,7 @@ LL | | };
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| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.len())`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:95:5
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--> $DIR/manual_map_option.rs:96:5
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LL | / match &mut &Some(String::new()) {
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LL | | Some(x) => Some(x.is_empty()),
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@ -128,7 +128,7 @@ LL | | };
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| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.is_empty())`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:100:5
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--> $DIR/manual_map_option.rs:101:5
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LL | / match Some((0, 1, 2)) {
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LL | | Some((x, y, z)) => Some(x + y + z),
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@ -137,7 +137,7 @@ LL | | };
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| |_____^ help: try this: `Some((0, 1, 2)).map(|(x, y, z)| x + y + z)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:105:5
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--> $DIR/manual_map_option.rs:106:5
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LL | / match Some([1, 2, 3]) {
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LL | | Some([first, ..]) => Some(first),
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@ -146,7 +146,7 @@ LL | | };
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| |_____^ help: try this: `Some([1, 2, 3]).map(|[first, ..]| first)`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:110:5
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--> $DIR/manual_map_option.rs:111:5
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LL | / match &Some((String::new(), "test")) {
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LL | | Some((x, y)) => Some((y, x)),
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@ -155,7 +155,7 @@ LL | | };
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| |_____^ help: try this: `Some((String::new(), "test")).as_ref().map(|(x, y)| (y, x))`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:168:5
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--> $DIR/manual_map_option.rs:169:5
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LL | / match Some(0) {
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LL | | Some(x) => Some(vec![x]),
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@ -164,7 +164,7 @@ LL | | };
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| |_____^ help: try this: `Some(0).map(|x| vec![x])`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:173:5
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--> $DIR/manual_map_option.rs:174:5
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LL | / match option_env!("") {
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LL | | Some(x) => Some(String::from(x)),
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@ -172,16 +172,19 @@ LL | | None => None,
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LL | | };
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| |_____^ help: try this: `option_env!("").map(String::from)`
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error: redundant pattern matching, consider using `is_some()`
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--> $DIR/manual_map_option.rs:191:12
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:194:12
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LL | if let Some(_) = Some(0) {
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| -------^^^^^^^---------- help: try this: `if Some(0).is_some()`
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= note: `-D clippy::redundant-pattern-matching` implied by `-D warnings`
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LL | } else if let Some(x) = Some(0) {
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| ____________^
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LL | | Some(x + 1)
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LL | | } else {
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LL | | None
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LL | | };
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| |_____^ help: try this: `{ Some(0).map(|x| x + 1) }`
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error: manual implementation of `Option::map`
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--> $DIR/manual_map_option.rs:193:12
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--> $DIR/manual_map_option.rs:202:12
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LL | } else if let Some(x) = Some(0) {
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| ____________^
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