diff --git a/crates/hir_def/src/body.rs b/crates/hir_def/src/body.rs
index 71375fe4a6e..ebb15e20cba 100644
--- a/crates/hir_def/src/body.rs
+++ b/crates/hir_def/src/body.rs
@@ -421,12 +421,12 @@ pub fn expr_syntax(&self, expr: ExprId) -> Result<ExprSource, SyntheticSyntax> {
     }
 
     pub fn node_expr(&self, node: InFile<&ast::Expr>) -> Option<ExprId> {
-        let src = node.map(|it| AstPtr::new(it));
+        let src = node.map(AstPtr::new);
         self.expr_map.get(&src).cloned()
     }
 
     pub fn node_macro_file(&self, node: InFile<&ast::MacroCall>) -> Option<HirFileId> {
-        let src = node.map(|it| AstPtr::new(it));
+        let src = node.map(AstPtr::new);
         self.expansions.get(&src).cloned()
     }
 
@@ -449,7 +449,7 @@ pub fn label_syntax(&self, label: LabelId) -> LabelSource {
     }
 
     pub fn node_label(&self, node: InFile<&ast::Label>) -> Option<LabelId> {
-        let src = node.map(|it| AstPtr::new(it));
+        let src = node.map(AstPtr::new);
         self.label_map.get(&src).cloned()
     }
 
@@ -457,7 +457,7 @@ pub fn field_syntax(&self, expr: ExprId) -> InFile<AstPtr<ast::RecordExprField>>
         self.field_map_back[&expr].clone()
     }
     pub fn node_field(&self, node: InFile<&ast::RecordExprField>) -> Option<ExprId> {
-        let src = node.map(|it| AstPtr::new(it));
+        let src = node.map(AstPtr::new);
         self.field_map.get(&src).cloned()
     }
 
diff --git a/crates/hir_def/src/body/lower.rs b/crates/hir_def/src/body/lower.rs
index ca337bd0057..512a9312a77 100644
--- a/crates/hir_def/src/body/lower.rs
+++ b/crates/hir_def/src/body/lower.rs
@@ -941,17 +941,15 @@ fn from(ast_lit_kind: ast::LiteralKind) -> Self {
             LiteralKind::IntNumber(lit) => {
                 if let builtin @ Some(_) = lit.suffix().and_then(BuiltinFloat::from_suffix) {
                     Literal::Float(Default::default(), builtin)
-                } else if let builtin @ Some(_) =
-                    lit.suffix().and_then(|it| BuiltinInt::from_suffix(it))
-                {
+                } else if let builtin @ Some(_) = lit.suffix().and_then(BuiltinInt::from_suffix) {
                     Literal::Int(lit.value().unwrap_or(0) as i128, builtin)
                 } else {
-                    let builtin = lit.suffix().and_then(|it| BuiltinUint::from_suffix(it));
+                    let builtin = lit.suffix().and_then(BuiltinUint::from_suffix);
                     Literal::Uint(lit.value().unwrap_or(0), builtin)
                 }
             }
             LiteralKind::FloatNumber(lit) => {
-                let ty = lit.suffix().and_then(|it| BuiltinFloat::from_suffix(it));
+                let ty = lit.suffix().and_then(BuiltinFloat::from_suffix);
                 Literal::Float(Default::default(), ty)
             }
             LiteralKind::ByteString(bs) => {
diff --git a/crates/hir_def/src/data.rs b/crates/hir_def/src/data.rs
index bb3a34a7c1e..456ed9e6103 100644
--- a/crates/hir_def/src/data.rs
+++ b/crates/hir_def/src/data.rs
@@ -66,7 +66,7 @@ pub(crate) fn fn_data_query(db: &dyn DefDatabase, func: FunctionId) -> Arc<Funct
             .by_key("rustc_legacy_const_generics")
             .tt_values()
             .next()
-            .map(|arg| parse_rustc_legacy_const_generics(arg))
+            .map(parse_rustc_legacy_const_generics)
             .unwrap_or_default();
 
         Arc::new(FunctionData {
diff --git a/crates/hir_expand/src/builtin_derive_macro.rs b/crates/hir_expand/src/builtin_derive_macro.rs
index 5a909e9a501..f7d5532df5e 100644
--- a/crates/hir_expand/src/builtin_derive_macro.rs
+++ b/crates/hir_expand/src/builtin_derive_macro.rs
@@ -88,9 +88,8 @@ fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, ExpandError> {
         debug!("parsed item has no name");
         ExpandError::Other("missing name".into())
     })?;
-    let name_token_id = token_map
-        .token_by_range(name.syntax().text_range())
-        .unwrap_or_else(|| TokenId::unspecified());
+    let name_token_id =
+        token_map.token_by_range(name.syntax().text_range()).unwrap_or_else(TokenId::unspecified);
     let name_token = tt::Ident { id: name_token_id, text: name.text().into() };
     let type_or_const_params =
         params.map_or(0, |type_param_list| type_param_list.type_or_const_params().count());
diff --git a/crates/hir_expand/src/builtin_fn_macro.rs b/crates/hir_expand/src/builtin_fn_macro.rs
index bdea31a166f..bad5f9aa243 100644
--- a/crates/hir_expand/src/builtin_fn_macro.rs
+++ b/crates/hir_expand/src/builtin_fn_macro.rs
@@ -446,7 +446,7 @@ fn concat_bytes_expand(
                 match token.kind() {
                     syntax::SyntaxKind::BYTE => bytes.push(token.text().to_string()),
                     syntax::SyntaxKind::BYTE_STRING => {
-                        let components = unquote_byte_string(lit).unwrap_or_else(|| Vec::new());
+                        let components = unquote_byte_string(lit).unwrap_or_else(Vec::new);
                         components.into_iter().for_each(|x| bytes.push(x.to_string()));
                     }
                     _ => {
diff --git a/crates/hir_ty/src/tls.rs b/crates/hir_ty/src/tls.rs
index 2045cf7bdfe..ad6cd36ca60 100644
--- a/crates/hir_ty/src/tls.rs
+++ b/crates/hir_ty/src/tls.rs
@@ -128,6 +128,6 @@ pub(crate) fn set_current_program<OP, R>(p: &dyn HirDatabase, op: OP) -> R
         // type.
         let static_p: &DebugContext<'static> =
             unsafe { std::mem::transmute::<&DebugContext, &DebugContext<'static>>(&ctx) };
-        PROGRAM.set(static_p, || op())
+        PROGRAM.set(static_p, op)
     }
 }
diff --git a/crates/ide/src/extend_selection.rs b/crates/ide/src/extend_selection.rs
index 5520ee55286..6111bdb94aa 100644
--- a/crates/ide/src/extend_selection.rs
+++ b/crates/ide/src/extend_selection.rs
@@ -283,7 +283,7 @@ fn nearby_delimiter(
         let final_node = delimiter_node
             .next_sibling_or_token()
             .and_then(|it| it.into_token())
-            .filter(|node| is_single_line_ws(node))
+            .filter(is_single_line_ws)
             .unwrap_or(delimiter_node);
 
         return Some(TextRange::new(node.text_range().start(), final_node.text_range().end()));
diff --git a/crates/ide_assists/src/handlers/extract_module.rs b/crates/ide_assists/src/handlers/extract_module.rs
index d8dda784c55..556659d07c9 100644
--- a/crates/ide_assists/src/handlers/extract_module.rs
+++ b/crates/ide_assists/src/handlers/extract_module.rs
@@ -417,7 +417,7 @@ fn change_visibility(&self, record_fields: Vec<SyntaxNode>) -> Option<Vec<ast::I
         replacements.append(&mut impl_item_replacements);
 
         record_field_parents.into_iter().for_each(|x| {
-            x.1.descendants().filter_map(|x| ast::RecordField::cast(x)).for_each(|desc| {
+            x.1.descendants().filter_map(ast::RecordField::cast).for_each(|desc| {
                 let is_record_field_present = record_fields
                     .clone()
                     .into_iter()
diff --git a/crates/ide_db/src/syntax_helpers/insert_whitespace_into_node.rs b/crates/ide_db/src/syntax_helpers/insert_whitespace_into_node.rs
index 0f1dd96f6ff..7f5563d9d09 100644
--- a/crates/ide_db/src/syntax_helpers/insert_whitespace_into_node.rs
+++ b/crates/ide_db/src/syntax_helpers/insert_whitespace_into_node.rs
@@ -85,7 +85,7 @@ pub fn insert_ws_into(syn: SyntaxNode) -> SyntaxNode {
                 }
                 mods.push(do_nl(after, tok));
             }
-            LIFETIME_IDENT if is_next(|it| is_text(it), true) => {
+            LIFETIME_IDENT if is_next(is_text, true) => {
                 mods.push(do_ws(after, tok));
             }
             AS_KW | DYN_KW | IMPL_KW => {
diff --git a/crates/ide_diagnostics/src/handlers/unlinked_file.rs b/crates/ide_diagnostics/src/handlers/unlinked_file.rs
index 5ea58b74fe3..9d46e2b0785 100644
--- a/crates/ide_diagnostics/src/handlers/unlinked_file.rs
+++ b/crates/ide_diagnostics/src/handlers/unlinked_file.rs
@@ -117,12 +117,7 @@ fn is_outline_mod(item: &ast::Item) -> bool {
     }
 
     // If there are existing `mod m;` items, append after them (after the first group of them, rather).
-    match ast
-        .items()
-        .skip_while(|item| !is_outline_mod(item))
-        .take_while(|item| is_outline_mod(item))
-        .last()
-    {
+    match ast.items().skip_while(|item| !is_outline_mod(item)).take_while(is_outline_mod).last() {
         Some(last) => {
             cov_mark::hit!(unlinked_file_append_to_existing_mods);
             let offset = last.syntax().text_range().end();
diff --git a/crates/syntax/src/ast/make.rs b/crates/syntax/src/ast/make.rs
index 19a007e072a..a69a77c7ee2 100644
--- a/crates/syntax/src/ast/make.rs
+++ b/crates/syntax/src/ast/make.rs
@@ -49,7 +49,7 @@ pub fn field_from_idents<'a>(
     ) -> Option<ast::Expr> {
         let mut iter = parts.into_iter();
         let base = expr_path(ext::ident_path(iter.next()?));
-        let expr = iter.fold(base, |base, s| expr_field(base, s));
+        let expr = iter.fold(base, expr_field);
         Some(expr)
     }