Improve match statement (#8817)

substrate/client/db/src/lib.rs

@@ -335,10 +335,7 @@ impl DatabaseSettingsSrc {
 	}
 	/// Check if database supports internal ref counting for state data.
 	pub fn supports_ref_counting(&self) -> bool {
-		match self {
-			DatabaseSettingsSrc::ParityDb { .. } => true,
-			_ => false,
-		}
+		matches!(self, DatabaseSettingsSrc::ParityDb { .. })
 	}
 }
 

substrate/primitives/core/src/crypto.rs

@@ -161,18 +161,12 @@ impl DeriveJunction {
 
 	/// Return `true` if the junction is soft.
 	pub fn is_soft(&self) -> bool {
-		match *self {
-			DeriveJunction::Soft(_) => true,
-			_ => false,
-		}
+		matches!(*self, DeriveJunction::Soft(_))
 	}
 
 	/// Return `true` if the junction is hard.
 	pub fn is_hard(&self) -> bool {
-		match *self {
-			DeriveJunction::Hard(_) => true,
-			_ => false,
-		}
+		matches!(*self, DeriveJunction::Hard(_))
 	}
 }
 
@@ -401,10 +395,7 @@ macro_rules! ss58_address_format {
 
 			/// Whether the address is custom.
 			pub fn is_custom(&self) -> bool {
-				match self {
-					Self::Custom(_) => true,
-					_ => false,
-				}
+				matches!(self, Self::Custom(_))
 			}
 		}
 

substrate/primitives/runtime-interface/proc-macro/src/runtime_interface/bare_function_interface.rs

@@ -239,8 +239,5 @@ fn generate_call_to_trait(
 
 /// Returns if the given `Signature` takes a `self` argument.
 fn takes_self_argument(sig: &Signature) -> bool {
-	match sig.inputs.first() {
-		Some(FnArg::Receiver(_)) => true,
-		_ => false,
-	}
+	matches!(sig.inputs.first(), Some(FnArg::Receiver(_)))
 }