error: unnecessary nested match --> $DIR/collapsible_match2.rs:13:34 | LL | Ok(val) if make() => match val { | __________________________________^ LL | | Some(n) => foo(n), LL | | _ => return, LL | | }, | |_____________^ | = note: `-D clippy::collapsible-match` implied by `-D warnings` help: the outer pattern can be modified to include the inner pattern --> $DIR/collapsible_match2.rs:13:16 | LL | Ok(val) if make() => match val { | ^^^ replace this binding LL | Some(n) => foo(n), | ^^^^^^^ with this pattern error: unnecessary nested match --> $DIR/collapsible_match2.rs:20:24 | LL | Ok(val) => match val { | ________________________^ LL | | Some(n) => foo(n), LL | | _ => return, LL | | }, | |_____________^ | help: the outer pattern can be modified to include the inner pattern --> $DIR/collapsible_match2.rs:20:16 | LL | Ok(val) => match val { | ^^^ replace this binding LL | Some(n) => foo(n), | ^^^^^^^ with this pattern error: unnecessary nested match --> $DIR/collapsible_match2.rs:34:29 | LL | $pat => match $e { | _____________________________^ LL | | $inner_pat => $then, LL | | _ => return, LL | | }, | |_____________________^ ... LL | mac!(res_opt => Ok(val), val => Some(n), foo(n)); | ------------------------------------------------- in this macro invocation | help: the outer pattern can be modified to include the inner pattern --> $DIR/collapsible_match2.rs:46:28 | LL | mac!(res_opt => Ok(val), val => Some(n), foo(n)); | ^^^ ^^^^^^^ with this pattern | | | replace this binding = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) error: unnecessary nested match --> $DIR/collapsible_match2.rs:51:20 | LL | Some(s) => match *s { | ____________________^ LL | | [n] => foo(n), LL | | _ => (), LL | | }, | |_________^ | help: the outer pattern can be modified to include the inner pattern --> $DIR/collapsible_match2.rs:51:14 | LL | Some(s) => match *s { | ^ replace this binding LL | [n] => foo(n), | ^^^ with this pattern error: unnecessary nested match --> $DIR/collapsible_match2.rs:60:24 | LL | Some(ref s) => match &*s { | ________________________^ LL | | [n] => foo(n), LL | | _ => (), LL | | }, | |_________^ | help: the outer pattern can be modified to include the inner pattern --> $DIR/collapsible_match2.rs:60:14 | LL | Some(ref s) => match &*s { | ^^^^^ replace this binding LL | [n] => foo(n), | ^^^ with this pattern error: aborting due to 5 previous errors