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More uses of the matches! macro #80467

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Dec 30, 2020
Merged

More uses of the matches! macro #80467

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14 changes: 4 additions & 10 deletions compiler/rustc_ast/src/ast.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1092,15 +1092,9 @@ impl Expr {
if let ExprKind::Block(ref block, _) = self.kind {
match block.stmts.last().map(|last_stmt| &last_stmt.kind) {
// Implicit return
Some(&StmtKind::Expr(_)) => true,
Some(&StmtKind::Semi(ref expr)) => {
if let ExprKind::Ret(_) = expr.kind {
// Last statement is explicit return.
true
} else {
false
}
}
Some(StmtKind::Expr(_)) => true,
// Last statement is an explicit return?
Some(StmtKind::Semi(expr)) => matches!(expr.kind, ExprKind::Ret(_)),
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// This is a block that doesn't end in either an implicit or explicit return.
_ => false,
}
Expand Down Expand Up @@ -1950,7 +1944,7 @@ impl TyKind {
}

pub fn is_unit(&self) -> bool {
if let TyKind::Tup(ref tys) = *self { tys.is_empty() } else { false }
matches!(self, TyKind::Tup(tys) if tys.is_empty())
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}
}

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11 changes: 5 additions & 6 deletions compiler/rustc_ast_lowering/src/lib.rs
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Expand Up @@ -1806,12 +1806,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
output,
c_variadic,
implicit_self: decl.inputs.get(0).map_or(hir::ImplicitSelfKind::None, |arg| {
let is_mutable_pat = match arg.pat.kind {
PatKind::Ident(BindingMode::ByValue(mt) | BindingMode::ByRef(mt), _, _) => {
mt == Mutability::Mut
}
_ => false,
};
use BindingMode::{ByRef, ByValue};
let is_mutable_pat = matches!(
arg.pat.kind,
PatKind::Ident(ByValue(Mutability::Mut) | ByRef(Mutability::Mut), ..)
);

match arg.ty.kind {
TyKind::ImplicitSelf if is_mutable_pat => hir::ImplicitSelfKind::Mut,
Expand Down