Replace if let with match where appropriate

Author: lunacookies

crates/hir/src/lib.rs

@@ -2119,10 +2119,9 @@ impl Impl {
         };
 
         let fp = TyFingerprint::for_inherent_impl(&ty);
-        let fp = if let Some(fp) = fp {
-            fp
-        } else {
-            return Vec::new();
+        let fp = match fp {
+            Some(fp) => fp,
+            None => return Vec::new(),
         };
 
         let mut all = Vec::new();

crates/hir_def/src/body/lower.rs

@@ -474,10 +474,9 @@ impl ExprCollector<'_> {
             }
             ast::Expr::PrefixExpr(e) => {
                 let expr = self.collect_expr_opt(e.expr());
-                if let Some(op) = e.op_kind() {
-                    self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr)
-                } else {
-                    self.alloc_expr(Expr::Missing, syntax_ptr)
+                match e.op_kind() {
+                    Some(op) => self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr),
+                    None => self.alloc_expr(Expr::Missing, syntax_ptr),
                 }
             }
             ast::Expr::ClosureExpr(e) => {
@@ -624,10 +623,9 @@ impl ExprCollector<'_> {
     }
 
     fn collect_expr_opt(&mut self, expr: Option<ast::Expr>) -> ExprId {
-        if let Some(expr) = expr {
-            self.collect_expr(expr)
-        } else {
-            self.missing_expr()
+        match expr {
+            Some(expr) => self.collect_expr(expr),
+            None => self.missing_expr(),
         }
     }
 
@@ -724,10 +722,9 @@ impl ExprCollector<'_> {
     }
 
     fn collect_block_opt(&mut self, expr: Option<ast::BlockExpr>) -> ExprId {
-        if let Some(block) = expr {
-            self.collect_block(block)
-        } else {
-            self.missing_expr()
+        match expr {
+            Some(block) => self.collect_block(block),
+            None => self.missing_expr(),
         }
     }
 
@@ -890,10 +887,9 @@ impl ExprCollector<'_> {
     }
 
     fn collect_pat_opt(&mut self, pat: Option<ast::Pat>) -> PatId {
-        if let Some(pat) = pat {
-            self.collect_pat(pat)
-        } else {
-            self.missing_pat()
+        match pat {
+            Some(pat) => self.collect_pat(pat),
+            None => self.missing_pat(),
         }
     }
 

crates/hir_def/src/find_path.rs

@@ -209,10 +209,9 @@ fn find_path_inner(
             ) {
                 path.push_segment(name);
 
-                let new_path = if let Some(best_path) = best_path {
-                    select_best_path(best_path, path, prefer_no_std)
-                } else {
-                    path
+                let new_path = match best_path {
+                    Some(best_path) => select_best_path(best_path, path, prefer_no_std),
+                    None => path,
                 };
                 best_path_len = new_path.len();
                 best_path = Some(new_path);
@@ -243,10 +242,9 @@ fn find_path_inner(
         });
 
         for path in extern_paths {
-            let new_path = if let Some(best_path) = best_path {
-                select_best_path(best_path, path, prefer_no_std)
-            } else {
-                path
+            let new_path = match best_path {
+                Some(best_path) => select_best_path(best_path, path, prefer_no_std),
+                None => path,
             };
             best_path = Some(new_path);
         }
@@ -261,12 +259,11 @@ fn find_path_inner(
         }
     }
 
-    if let Some(prefix) = prefixed.map(PrefixKind::prefix) {
-        best_path.or_else(|| {
+    match prefixed.map(PrefixKind::prefix) {
+        Some(prefix) => best_path.or_else(|| {
             scope_name.map(|scope_name| ModPath::from_segments(prefix, vec![scope_name]))
-        })
-    } else {
-        best_path
+        }),
+        None => best_path,
     }
 }
 
@@ -346,15 +343,13 @@ fn find_local_import_locations(
 
         if let Some((name, vis)) = data.scope.name_of(item) {
             if vis.is_visible_from(db, from) {
-                let is_private = if let Visibility::Module(private_to) = vis {
-                    private_to.local_id == module.local_id
-                } else {
-                    false
+                let is_private = match vis {
+                    Visibility::Module(private_to) => private_to.local_id == module.local_id,
+                    Visibility::Public => false,
                 };
-                let is_original_def = if let Some(module_def_id) = item.as_module_def_id() {
-                    data.scope.declarations().any(|it| it == module_def_id)
-                } else {
-                    false
+                let is_original_def = match item.as_module_def_id() {
+                    Some(module_def_id) => data.scope.declarations().any(|it| it == module_def_id),
+                    None => false,
                 };
 
                 // Ignore private imports. these could be used if we are

crates/hir_def/src/item_tree.rs

@@ -475,10 +475,9 @@ macro_rules! mod_items {
                 }
 
                 fn id_from_mod_item(mod_item: ModItem) -> Option<FileItemTreeId<Self>> {
-                    if let ModItem::$typ(id) = mod_item {
-                        Some(id)
-                    } else {
-                        None
+                    match mod_item {
+                        ModItem::$typ(id) => Some(id),
+                        _ => None,
                     }
                 }
 

crates/hir_def/src/nameres/path_resolution.rs

@@ -400,13 +400,10 @@ impl DefMap {
         };
         let from_scope_or_builtin = match shadow {
             BuiltinShadowMode::Module => from_scope.or(from_builtin),
-            BuiltinShadowMode::Other => {
-                if let Some(ModuleDefId::ModuleId(_)) = from_scope.take_types() {
-                    from_builtin.or(from_scope)
-                } else {
-                    from_scope.or(from_builtin)
-                }
-            }
+            BuiltinShadowMode::Other => match from_scope.take_types() {
+                Some(ModuleDefId::ModuleId(_)) => from_builtin.or(from_scope),
+                Some(_) | None => from_scope.or(from_builtin),
+            },
         };
         let from_extern_prelude = self
             .extern_prelude

crates/hir_def/src/path/lower/lower_use.rs

@@ -18,10 +18,9 @@ pub(crate) fn convert_path(
     path: ast::Path,
     hygiene: &Hygiene,
 ) -> Option<ModPath> {
-    let prefix = if let Some(qual) = path.qualifier() {
-        Some(convert_path(db, prefix, qual, hygiene)?)
-    } else {
-        prefix
+    let prefix = match path.qualifier() {
+        Some(qual) => Some(convert_path(db, prefix, qual, hygiene)?),
+        None => prefix,
     };
 
     let segment = path.segment()?;

crates/hir_def/src/type_ref.rs

@@ -214,10 +214,9 @@ impl TypeRef {
     }
 
     pub(crate) fn from_ast_opt(ctx: &LowerCtx, node: Option<ast::Type>) -> Self {
-        if let Some(node) = node {
-            TypeRef::from_ast(ctx, node)
-        } else {
-            TypeRef::Error
+        match node {
+            Some(node) => TypeRef::from_ast(ctx, node),
+            None => TypeRef::Error,
         }
     }
 

crates/hir_expand/src/name.rs

@@ -48,10 +48,9 @@ impl Name {
 
     /// Resolve a name from the text of token.
     fn resolve(raw_text: &str) -> Name {
-        if let Some(text) = raw_text.strip_prefix("r#") {
-            Name::new_text(SmolStr::new(text))
-        } else {
-            Name::new_text(raw_text.into())
+        match raw_text.strip_prefix("r#") {
+            Some(text) => Name::new_text(SmolStr::new(text)),
+            None => Name::new_text(raw_text.into()),
         }
     }
 

crates/hir_ty/src/autoderef.rs

@@ -109,10 +109,9 @@ pub(crate) fn deref(
     ty: InEnvironment<&Canonical<Ty>>,
 ) -> Option<Canonical<Ty>> {
     let _p = profile::span("deref");
-    if let Some(derefed) = builtin_deref(&ty.goal.value) {
-        Some(Canonical { value: derefed, binders: ty.goal.binders.clone() })
-    } else {
-        deref_by_trait(db, krate, ty)
+    match builtin_deref(&ty.goal.value) {
+        Some(derefed) => Some(Canonical { value: derefed, binders: ty.goal.binders.clone() }),
+        None => deref_by_trait(db, krate, ty),
     }
 }
 

crates/hir_ty/src/chalk_ext.rs

@@ -104,10 +104,9 @@ impl TyExt for Ty {
     }
 
     fn as_fn_def(&self, db: &dyn HirDatabase) -> Option<FunctionId> {
-        if let Some(CallableDefId::FunctionId(func)) = self.callable_def(db) {
-            Some(func)
-        } else {
-            None
+        match self.callable_def(db) {
+            Some(CallableDefId::FunctionId(func)) => Some(func),
+            Some(CallableDefId::StructId(_) | CallableDefId::EnumVariantId(_)) | None => None,
         }
     }
     fn as_reference(&self) -> Option<(&Ty, Lifetime, Mutability)> {