Auto merge of rust-lang#5529 - alex-700:improve-option-and-then-some-lint, r=phansch

Improve `option_and_then_some` lint

fixed rust-lang#5492

changelog: Improve and generalize `option_and_then_some` and rename it to `bind_instead_of_map`.

Author: bors

CHANGELOG.md

@@ -315,7 +315,7 @@ Released 2019-11-07
   * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535)
   * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511)
   * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394)
-  * [`option_and_then_some`] [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
+  * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
   * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498)
 * Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348)
 * Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403)
@@ -1273,6 +1273,7 @@ Released 2018-09-13
 [`assign_ops`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_ops
 [`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock
 [`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask
+[`bind_instead_of_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#bind_instead_of_map
 [`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name
 [`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions
 [`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
@@ -1494,7 +1495,6 @@ Released 2018-09-13
 [`not_unsafe_ptr_arg_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#not_unsafe_ptr_arg_deref
 [`ok_expect`]: https://rust-lang.github.io/rust-clippy/master/index.html#ok_expect
 [`op_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#op_ref
-[`option_and_then_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_and_then_some
 [`option_as_ref_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_as_ref_deref
 [`option_env_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_env_unwrap
 [`option_map_or_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_or_none

clippy_lints/src/eq_op.rs

@@ -115,7 +115,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EqOp {
                                     let rsnip = snippet(cx, r.span, "...").to_string();
                                     multispan_sugg(
                                         diag,
-                                        "use the values directly".to_string(),
+                                        "use the values directly",
                                         vec![(left.span, lsnip), (right.span, rsnip)],
                                     );
                                 },

clippy_lints/src/lib.rs

@@ -650,6 +650,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &mem_replace::MEM_REPLACE_OPTION_WITH_NONE,
         &mem_replace::MEM_REPLACE_WITH_DEFAULT,
         &mem_replace::MEM_REPLACE_WITH_UNINIT,
+        &methods::BIND_INSTEAD_OF_MAP,
         &methods::CHARS_LAST_CMP,
         &methods::CHARS_NEXT_CMP,
         &methods::CLONE_DOUBLE_REF,
@@ -676,7 +677,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &methods::MAP_UNWRAP_OR,
         &methods::NEW_RET_NO_SELF,
         &methods::OK_EXPECT,
-        &methods::OPTION_AND_THEN_SOME,
         &methods::OPTION_AS_REF_DEREF,
         &methods::OPTION_MAP_OR_NONE,
         &methods::OR_FUN_CALL,
@@ -1291,6 +1291,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
         LintId::of(&mem_replace::MEM_REPLACE_WITH_DEFAULT),
         LintId::of(&mem_replace::MEM_REPLACE_WITH_UNINIT),
+        LintId::of(&methods::BIND_INSTEAD_OF_MAP),
         LintId::of(&methods::CHARS_LAST_CMP),
         LintId::of(&methods::CHARS_NEXT_CMP),
         LintId::of(&methods::CLONE_DOUBLE_REF),
@@ -1307,7 +1308,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&methods::MANUAL_SATURATING_ARITHMETIC),
         LintId::of(&methods::NEW_RET_NO_SELF),
         LintId::of(&methods::OK_EXPECT),
-        LintId::of(&methods::OPTION_AND_THEN_SOME),
         LintId::of(&methods::OPTION_AS_REF_DEREF),
         LintId::of(&methods::OPTION_MAP_OR_NONE),
         LintId::of(&methods::OR_FUN_CALL),
@@ -1559,10 +1559,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&matches::MATCH_AS_REF),
         LintId::of(&matches::MATCH_SINGLE_BINDING),
         LintId::of(&matches::WILDCARD_IN_OR_PATTERNS),
+        LintId::of(&methods::BIND_INSTEAD_OF_MAP),
         LintId::of(&methods::CLONE_ON_COPY),
         LintId::of(&methods::FILTER_NEXT),
         LintId::of(&methods::FLAT_MAP_IDENTITY),
-        LintId::of(&methods::OPTION_AND_THEN_SOME),
         LintId::of(&methods::OPTION_AS_REF_DEREF),
         LintId::of(&methods::SEARCH_IS_SOME),
         LintId::of(&methods::SKIP_WHILE_NEXT),
@@ -1784,6 +1784,7 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) {
     ls.register_renamed("clippy::new_without_default_derive", "clippy::new_without_default");
     ls.register_renamed("clippy::cyclomatic_complexity", "clippy::cognitive_complexity");
     ls.register_renamed("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes");
+    ls.register_renamed("clippy::option_and_then_some", "clippy::bind_instead_of_map");
     ls.register_renamed("clippy::block_in_if_condition_expr", "clippy::blocks_in_if_conditions");
     ls.register_renamed("clippy::block_in_if_condition_stmt", "clippy::blocks_in_if_conditions");
     ls.register_renamed("clippy::option_map_unwrap_or", "clippy::map_unwrap_or");

clippy_lints/src/loops.rs

@@ -1134,7 +1134,7 @@ fn check_for_loop_range<'a, 'tcx>(
                         |diag| {
                             multispan_sugg(
                                 diag,
-                                "consider using an iterator".to_string(),
+                                "consider using an iterator",
                                 vec![
                                     (pat.span, format!("({}, <item>)", ident.name)),
                                     (
@@ -1163,7 +1163,7 @@ fn check_for_loop_range<'a, 'tcx>(
                         |diag| {
                             multispan_sugg(
                                 diag,
-                                "consider using an iterator".to_string(),
+                                "consider using an iterator",
                                 vec![(pat.span, "<item>".to_string()), (arg.span, repl)],
                             );
                         },
@@ -1462,7 +1462,7 @@ fn check_for_loop_over_map_kv<'a, 'tcx>(
                         let map = sugg::Sugg::hir(cx, arg, "map");
                         multispan_sugg(
                             diag,
-                            "use the corresponding method".into(),
+                            "use the corresponding method",
                             vec![
                                 (pat_span, snippet(cx, new_pat_span, kind).into_owned()),
                                 (arg_span, format!("{}.{}s{}()", map.maybe_par(), kind, mutbl)),

clippy_lints/src/matches.rs

@@ -820,7 +820,7 @@ fn check_match_ref_pats(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_>
 
         span_lint_and_then(cx, MATCH_REF_PATS, expr.span, title, |diag| {
             if !expr.span.from_expansion() {
-                multispan_sugg(diag, msg.to_owned(), suggs);
+                multispan_sugg(diag, msg, suggs);
             }
         });
     }