Resolve unnecessary_map_or clippy lints

    warning: this `map_or` is redundant
      --> gen/build/src/target.rs:31:20
       |
    31 |                   && dir
       |  ____________________^
    32 | |                     .parent()
    33 | |                     .map_or(false, |parent| parent.join("Cargo.toml").exists())
       | |_______________________________________________________________________________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
    help: use is_some_and instead
       |
    31 ~                 && dir
    32 +                     .parent().is_some_and(|parent| parent.join("Cargo.toml").exists())
       |

    warning: this `map_or` is redundant
        --> gen/src/write.rs:1151:5
         |
    1151 | /     sig.ret
    1152 | |         .as_ref()
    1153 | |         .map_or(false, |ret| sig.throws || types.needs_indirect_abi(ret))
         | |_________________________________________________________________________^
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
         = note: `-W clippy::unnecessary-map-or` implied by `-W clippy::all`
         = help: to override `-W clippy::all` add `#[allow(clippy::unnecessary_map_or)]`
    help: use is_some_and instead
         |
    1151 ~     sig.ret
    1152 +         .as_ref().is_some_and(|ret| sig.throws || types.needs_indirect_abi(ret))
         |

    warning: this `map_or` is redundant
        --> macro/src/expand.rs:1837:5
         |
    1837 | /     sig.ret
    1838 | |         .as_ref()
    1839 | |         .map_or(false, |ret| sig.throws || types.needs_indirect_abi(ret))
         | |_________________________________________________________________________^
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
         = note: `-W clippy::unnecessary-map-or` implied by `-W clippy::all`
         = help: to override `-W clippy::all` add `#[allow(clippy::unnecessary_map_or)]`
    help: use is_some_and instead
         |
    1837 ~     sig.ret
    1838 +         .as_ref().is_some_and(|ret| sig.throws || types.needs_indirect_abi(ret))
         |

Author: dtolnay

gen/build/src/target.rs

@@ -30,7 +30,7 @@ pub(crate) fn find_target_dir(out_dir: &Path) -> TargetDir {
             || dir.file_name() == Some(OsStr::new("target"))
                 && dir
                     .parent()
-                    .map_or(false, |parent| parent.join("Cargo.toml").exists())
+                    .is_some_and(|parent| parent.join("Cargo.toml").exists())
         {
             return TargetDir::Path(dir);
         }

gen/src/write.rs

@@ -1150,7 +1150,7 @@ fn write_return_type(out: &mut OutFile, ty: &Option<Type>) {
 fn indirect_return(sig: &Signature, types: &Types) -> bool {
     sig.ret
         .as_ref()
-        .map_or(false, |ret| sig.throws || types.needs_indirect_abi(ret))
+        .is_some_and(|ret| sig.throws || types.needs_indirect_abi(ret))
 }
 
 fn write_indirect_return_type(out: &mut OutFile, ty: &Type) {

macro/src/expand.rs

@@ -1836,7 +1836,7 @@ fn expand_return_type(ret: &Option<Type>) -> TokenStream {
 fn indirect_return(sig: &Signature, types: &Types) -> bool {
     sig.ret
         .as_ref()
-        .map_or(false, |ret| sig.throws || types.needs_indirect_abi(ret))
+        .is_some_and(|ret| sig.throws || types.needs_indirect_abi(ret))
 }
 
 fn expand_extern_type(ty: &Type, types: &Types, proper: bool) -> TokenStream {