diff --git a/crates/ra_assists/src/handlers/add_explicit_type.rs b/crates/ra_assists/src/handlers/add_explicit_type.rs
index 39a5321d17..e69f0a89b2 100644
--- a/crates/ra_assists/src/handlers/add_explicit_type.rs
+++ b/crates/ra_assists/src/handlers/add_explicit_type.rs
@@ -1,6 +1,6 @@
 use hir::HirDisplay;
 use ra_syntax::{
-    ast::{self, AstNode, LetStmt, NameOwner, TypeAscriptionOwner},
+    ast::{self, AstNode, LetStmt, NameOwner},
     TextRange,
 };
 
@@ -22,11 +22,11 @@ use crate::{AssistContext, AssistId, AssistKind, Assists};
 // }
 // ```
 pub(crate) fn add_explicit_type(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
-    let stmt = ctx.find_node_at_offset::<LetStmt>()?;
-    let module = ctx.sema.scope(stmt.syntax()).module()?;
-    let expr = stmt.initializer()?;
+    let let_stmt = ctx.find_node_at_offset::<LetStmt>()?;
+    let module = ctx.sema.scope(let_stmt.syntax()).module()?;
+    let expr = let_stmt.initializer()?;
     // Must be a binding
-    let pat = match stmt.pat()? {
+    let pat = match let_stmt.pat()? {
         ast::Pat::BindPat(bind_pat) => bind_pat,
         _ => return None,
     };
@@ -34,8 +34,8 @@ pub(crate) fn add_explicit_type(acc: &mut Assists, ctx: &AssistContext) -> Optio
     // The binding must have a name
     let name = pat.name()?;
     let name_range = name.syntax().text_range();
-    let stmt_range = stmt.syntax().text_range();
-    let eq_range = stmt.eq_token()?.text_range();
+    let stmt_range = let_stmt.syntax().text_range();
+    let eq_range = let_stmt.eq_token()?.text_range();
     // Assist should only be applicable if cursor is between 'let' and '='
     let let_range = TextRange::new(stmt_range.start(), eq_range.start());
     let cursor_in_range = let_range.contains_range(ctx.frange.range);
@@ -44,7 +44,7 @@ pub(crate) fn add_explicit_type(acc: &mut Assists, ctx: &AssistContext) -> Optio
     }
     // Assist not applicable if the type has already been specified
     // and it has no placeholders
-    let ascribed_ty = stmt.ascribed_type();
+    let ascribed_ty = let_stmt.ty();
     if let Some(ty) = &ascribed_ty {
         if ty.syntax().descendants().find_map(ast::PlaceholderType::cast).is_none() {
             return None;
diff --git a/crates/ra_assists/src/handlers/generate_new.rs b/crates/ra_assists/src/handlers/generate_new.rs
index 3c67749eec..b84aa24b6c 100644
--- a/crates/ra_assists/src/handlers/generate_new.rs
+++ b/crates/ra_assists/src/handlers/generate_new.rs
@@ -1,9 +1,6 @@
 use hir::Adt;
 use ra_syntax::{
-    ast::{
-        self, AstNode, GenericParamsOwner, NameOwner, StructKind, TypeAscriptionOwner,
-        VisibilityOwner,
-    },
+    ast::{self, AstNode, GenericParamsOwner, NameOwner, StructKind, VisibilityOwner},
     T,
 };
 use stdx::{format_to, SepBy};
@@ -54,9 +51,7 @@ pub(crate) fn generate_new(acc: &mut Assists, ctx: &AssistContext) -> Option<()>
 
         let params = field_list
             .fields()
-            .filter_map(|f| {
-                Some(format!("{}: {}", f.name()?.syntax(), f.ascribed_type()?.syntax()))
-            })
+            .filter_map(|f| Some(format!("{}: {}", f.name()?.syntax(), f.ty()?.syntax())))
             .sep_by(", ");
         let fields = field_list.fields().filter_map(|f| f.name()).sep_by(", ");
 
diff --git a/crates/ra_assists/src/handlers/introduce_named_lifetime.rs b/crates/ra_assists/src/handlers/introduce_named_lifetime.rs
index 92a1a5925c..c3134f64d0 100644
--- a/crates/ra_assists/src/handlers/introduce_named_lifetime.rs
+++ b/crates/ra_assists/src/handlers/introduce_named_lifetime.rs
@@ -1,5 +1,5 @@
 use ra_syntax::{
-    ast::{self, GenericParamsOwner, NameOwner, TypeAscriptionOwner},
+    ast::{self, GenericParamsOwner, NameOwner},
     AstNode, SyntaxKind, TextRange, TextSize,
 };
 use rustc_hash::FxHashSet;
@@ -67,7 +67,7 @@ fn generate_fn_def_assist(
         // otherwise, if there's a single reference parameter without a named liftime, use that
         let fn_params_without_lifetime: Vec<_> = param_list
             .params()
-            .filter_map(|param| match param.ascribed_type() {
+            .filter_map(|param| match param.ty() {
                 Some(ast::TypeRef::ReferenceType(ascribed_type))
                     if ascribed_type.lifetime_token() == None =>
                 {
diff --git a/crates/ra_hir_def/src/adt.rs b/crates/ra_hir_def/src/adt.rs
index 231c1dfab8..f8523d03fa 100644
--- a/crates/ra_hir_def/src/adt.rs
+++ b/crates/ra_hir_def/src/adt.rs
@@ -8,7 +8,7 @@ use hir_expand::{
     InFile,
 };
 use ra_arena::{map::ArenaMap, Arena};
-use ra_syntax::ast::{self, NameOwner, TypeAscriptionOwner, VisibilityOwner};
+use ra_syntax::ast::{self, NameOwner, VisibilityOwner};
 
 use crate::{
     body::{CfgExpander, LowerCtx},
@@ -251,7 +251,7 @@ fn lower_struct(
                     || Either::Right(fd.clone()),
                     || FieldData {
                         name: fd.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
-                        type_ref: TypeRef::from_ast_opt(&ctx, fd.ascribed_type()),
+                        type_ref: TypeRef::from_ast_opt(&ctx, fd.ty()),
                         visibility: RawVisibility::from_ast(db, ast.with_value(fd.visibility())),
                     },
                 );
diff --git a/crates/ra_hir_def/src/body/lower.rs b/crates/ra_hir_def/src/body/lower.rs
index 78f6da5b8b..288ca76c31 100644
--- a/crates/ra_hir_def/src/body/lower.rs
+++ b/crates/ra_hir_def/src/body/lower.rs
@@ -11,7 +11,7 @@ use ra_arena::Arena;
 use ra_syntax::{
     ast::{
         self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, ModuleItemOwner, NameOwner,
-        SlicePatComponents, TypeAscriptionOwner,
+        SlicePatComponents,
     },
     AstNode, AstPtr,
 };
@@ -466,8 +466,7 @@ impl ExprCollector<'_> {
                 if let Some(pl) = e.param_list() {
                     for param in pl.params() {
                         let pat = self.collect_pat_opt(param.pat());
-                        let type_ref =
-                            param.ascribed_type().map(|it| TypeRef::from_ast(&self.ctx(), it));
+                        let type_ref = param.ty().map(|it| TypeRef::from_ast(&self.ctx(), it));
                         args.push(pat);
                         arg_types.push(type_ref);
                     }
@@ -607,8 +606,7 @@ impl ExprCollector<'_> {
             .map(|s| match s {
                 ast::Stmt::LetStmt(stmt) => {
                     let pat = self.collect_pat_opt(stmt.pat());
-                    let type_ref =
-                        stmt.ascribed_type().map(|it| TypeRef::from_ast(&self.ctx(), it));
+                    let type_ref = stmt.ty().map(|it| TypeRef::from_ast(&self.ctx(), it));
                     let initializer = stmt.initializer().map(|e| self.collect_expr(e));
                     Statement::Let { pat, type_ref, initializer }
                 }
diff --git a/crates/ra_hir_def/src/item_tree.rs b/crates/ra_hir_def/src/item_tree.rs
index 63b56405c5..a67e75dac0 100644
--- a/crates/ra_hir_def/src/item_tree.rs
+++ b/crates/ra_hir_def/src/item_tree.rs
@@ -13,7 +13,7 @@ use std::{
     sync::Arc,
 };
 
-use ast::{AstNode, AttrsOwner, NameOwner, StructKind, TypeAscriptionOwner};
+use ast::{AstNode, AttrsOwner, NameOwner, StructKind};
 use either::Either;
 use hir_expand::{
     ast_id_map::FileAstId,
diff --git a/crates/ra_hir_def/src/item_tree/lower.rs b/crates/ra_hir_def/src/item_tree/lower.rs
index 29f1de5477..f0ced1f795 100644
--- a/crates/ra_hir_def/src/item_tree/lower.rs
+++ b/crates/ra_hir_def/src/item_tree/lower.rs
@@ -209,7 +209,7 @@ impl Ctx {
     fn lower_record_field(&mut self, field: &ast::RecordField) -> Option<Field> {
         let name = field.name()?.as_name();
         let visibility = self.lower_visibility(field);
-        let type_ref = self.lower_type_ref_opt(field.ascribed_type());
+        let type_ref = self.lower_type_ref_opt(field.ty());
         let res = Field { name, type_ref, visibility };
         Some(res)
     }
@@ -286,7 +286,7 @@ impl Ctx {
         let mut has_self_param = false;
         if let Some(param_list) = func.param_list() {
             if let Some(self_param) = param_list.self_param() {
-                let self_type = match self_param.ascribed_type() {
+                let self_type = match self_param.ty() {
                     Some(type_ref) => TypeRef::from_ast(&self.body_ctx, type_ref),
                     None => {
                         let self_type = TypeRef::Path(name![Self].into());
@@ -305,7 +305,7 @@ impl Ctx {
                 has_self_param = true;
             }
             for param in param_list.params() {
-                let type_ref = TypeRef::from_ast_opt(&self.body_ctx, param.ascribed_type());
+                let type_ref = TypeRef::from_ast_opt(&self.body_ctx, param.ty());
                 params.push(type_ref);
             }
         }
@@ -370,7 +370,7 @@ impl Ctx {
 
     fn lower_static(&mut self, static_: &ast::Static) -> Option<FileItemTreeId<Static>> {
         let name = static_.name()?.as_name();
-        let type_ref = self.lower_type_ref_opt(static_.ascribed_type());
+        let type_ref = self.lower_type_ref_opt(static_.ty());
         let visibility = self.lower_visibility(static_);
         let mutable = static_.mut_token().is_some();
         let ast_id = self.source_ast_id_map.ast_id(static_);
@@ -380,7 +380,7 @@ impl Ctx {
 
     fn lower_const(&mut self, konst: &ast::Const) -> FileItemTreeId<Const> {
         let name = konst.name().map(|it| it.as_name());
-        let type_ref = self.lower_type_ref_opt(konst.ascribed_type());
+        let type_ref = self.lower_type_ref_opt(konst.ty());
         let visibility = self.lower_visibility(konst);
         let ast_id = self.source_ast_id_map.ast_id(konst);
         let res = Const { name, visibility, type_ref, ast_id };
diff --git a/crates/ra_hir_def/src/path/lower.rs b/crates/ra_hir_def/src/path/lower.rs
index 6a0c019fdf..dfab15948a 100644
--- a/crates/ra_hir_def/src/path/lower.rs
+++ b/crates/ra_hir_def/src/path/lower.rs
@@ -9,7 +9,7 @@ use hir_expand::{
     hygiene::Hygiene,
     name::{name, AsName},
 };
-use ra_syntax::ast::{self, AstNode, TypeAscriptionOwner, TypeBoundsOwner};
+use ra_syntax::ast::{self, AstNode, TypeBoundsOwner};
 
 use super::AssociatedTypeBinding;
 use crate::{
@@ -189,7 +189,7 @@ fn lower_generic_args_from_fn_path(
     if let Some(params) = params {
         let mut param_types = Vec::new();
         for param in params.params() {
-            let type_ref = TypeRef::from_ast_opt(&ctx, param.ascribed_type());
+            let type_ref = TypeRef::from_ast_opt(&ctx, param.ty());
             param_types.push(type_ref);
         }
         let arg = GenericArg::Type(TypeRef::Tuple(param_types));
diff --git a/crates/ra_hir_def/src/type_ref.rs b/crates/ra_hir_def/src/type_ref.rs
index 970fc9af54..4059302dfc 100644
--- a/crates/ra_hir_def/src/type_ref.rs
+++ b/crates/ra_hir_def/src/type_ref.rs
@@ -1,7 +1,7 @@
 //! HIR for references to types. Paths in these are not yet resolved. They can
 //! be directly created from an ast::TypeRef, without further queries.
 
-use ra_syntax::ast::{self, TypeAscriptionOwner};
+use ra_syntax::ast::{self};
 
 use crate::{body::LowerCtx, path::Path};
 
@@ -124,10 +124,7 @@ impl TypeRef {
                         is_varargs = param.dotdotdot_token().is_some();
                     }
 
-                    pl.params()
-                        .map(|p| p.ascribed_type())
-                        .map(|it| TypeRef::from_ast_opt(&ctx, it))
-                        .collect()
+                    pl.params().map(|p| p.ty()).map(|it| TypeRef::from_ast_opt(&ctx, it)).collect()
                 } else {
                     Vec::new()
                 };
diff --git a/crates/ra_ide/src/display/short_label.rs b/crates/ra_ide/src/display/short_label.rs
index c600908a48..bddf1bd474 100644
--- a/crates/ra_ide/src/display/short_label.rs
+++ b/crates/ra_ide/src/display/short_label.rs
@@ -1,6 +1,6 @@
 //! FIXME: write short doc here
 
-use ra_syntax::ast::{self, AstNode, NameOwner, TypeAscriptionOwner, VisibilityOwner};
+use ra_syntax::ast::{self, AstNode, NameOwner, VisibilityOwner};
 use stdx::format_to;
 
 pub(crate) trait ShortLabel {
@@ -55,19 +55,19 @@ impl ShortLabel for ast::TypeAlias {
 
 impl ShortLabel for ast::Const {
     fn short_label(&self) -> Option<String> {
-        short_label_from_ascribed_node(self, "const ")
+        short_label_from_ty(self, self.ty(), "const ")
     }
 }
 
 impl ShortLabel for ast::Static {
     fn short_label(&self) -> Option<String> {
-        short_label_from_ascribed_node(self, "static ")
+        short_label_from_ty(self, self.ty(), "static ")
     }
 }
 
 impl ShortLabel for ast::RecordField {
     fn short_label(&self) -> Option<String> {
-        short_label_from_ascribed_node(self, "")
+        short_label_from_ty(self, self.ty(), "")
     }
 }
 
@@ -77,13 +77,13 @@ impl ShortLabel for ast::Variant {
     }
 }
 
-fn short_label_from_ascribed_node<T>(node: &T, prefix: &str) -> Option<String>
+fn short_label_from_ty<T>(node: &T, ty: Option<ast::TypeRef>, prefix: &str) -> Option<String>
 where
-    T: NameOwner + VisibilityOwner + TypeAscriptionOwner,
+    T: NameOwner + VisibilityOwner,
 {
     let mut buf = short_label_from_node(node, prefix)?;
 
-    if let Some(type_ref) = node.ascribed_type() {
+    if let Some(type_ref) = ty {
         format_to!(buf, ": {}", type_ref.syntax());
     }
 
diff --git a/crates/ra_ide/src/file_structure.rs b/crates/ra_ide/src/file_structure.rs
index 7d378f2d0a..22cf8637a8 100644
--- a/crates/ra_ide/src/file_structure.rs
+++ b/crates/ra_ide/src/file_structure.rs
@@ -1,5 +1,5 @@
 use ra_syntax::{
-    ast::{self, AttrsOwner, GenericParamsOwner, NameOwner, TypeAscriptionOwner},
+    ast::{self, AttrsOwner, GenericParamsOwner, NameOwner},
     match_ast, AstNode, SourceFile, SyntaxKind, SyntaxNode, TextRange, WalkEvent,
 };
 
@@ -52,18 +52,11 @@ pub fn file_structure(file: &SourceFile) -> Vec<StructureNode> {
 
 fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
     fn decl<N: NameOwner + AttrsOwner>(node: N) -> Option<StructureNode> {
-        decl_with_detail(node, None)
-    }
-
-    fn decl_with_ascription<N: NameOwner + AttrsOwner + TypeAscriptionOwner>(
-        node: N,
-    ) -> Option<StructureNode> {
-        let ty = node.ascribed_type();
-        decl_with_type_ref(node, ty)
+        decl_with_detail(&node, None)
     }
 
     fn decl_with_type_ref<N: NameOwner + AttrsOwner>(
-        node: N,
+        node: &N,
         type_ref: Option<ast::TypeRef>,
     ) -> Option<StructureNode> {
         let detail = type_ref.map(|type_ref| {
@@ -75,7 +68,7 @@ fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
     }
 
     fn decl_with_detail<N: NameOwner + AttrsOwner>(
-        node: N,
+        node: &N,
         detail: Option<String>,
     ) -> Option<StructureNode> {
         let name = node.name()?;
@@ -124,7 +117,7 @@ fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
                     collapse_ws(ret_type.syntax(), &mut detail);
                 }
 
-                decl_with_detail(it, Some(detail))
+                decl_with_detail(&it, Some(detail))
             },
             ast::Struct(it) => decl(it),
             ast::Union(it) => decl(it),
@@ -132,13 +125,10 @@ fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
             ast::Variant(it) => decl(it),
             ast::Trait(it) => decl(it),
             ast::Module(it) => decl(it),
-            ast::TypeAlias(it) => {
-                let ty = it.type_ref();
-                decl_with_type_ref(it, ty)
-            },
-            ast::RecordField(it) => decl_with_ascription(it),
-            ast::Const(it) => decl_with_ascription(it),
-            ast::Static(it) => decl_with_ascription(it),
+            ast::TypeAlias(it) => decl_with_type_ref(&it, it.type_ref()),
+            ast::RecordField(it) => decl_with_type_ref(&it, it.ty()),
+            ast::Const(it) => decl_with_type_ref(&it, it.ty()),
+            ast::Static(it) => decl_with_type_ref(&it, it.ty()),
             ast::Impl(it) => {
                 let target_type = it.target_type()?;
                 let target_trait = it.target_trait();
diff --git a/crates/ra_ide/src/inlay_hints.rs b/crates/ra_ide/src/inlay_hints.rs
index 714ba6bd99..4bbbcd258f 100644
--- a/crates/ra_ide/src/inlay_hints.rs
+++ b/crates/ra_ide/src/inlay_hints.rs
@@ -2,7 +2,7 @@ use hir::{Adt, Callable, HirDisplay, Semantics, Type};
 use ra_ide_db::RootDatabase;
 use ra_prof::profile;
 use ra_syntax::{
-    ast::{self, ArgListOwner, AstNode, TypeAscriptionOwner},
+    ast::{self, ArgListOwner, AstNode},
     match_ast, Direction, NodeOrToken, SmolStr, SyntaxKind, TextRange, T,
 };
 use stdx::to_lower_snake_case;
@@ -230,10 +230,10 @@ fn should_not_display_type_hint(db: &RootDatabase, bind_pat: &ast::BindPat, pat_
         match_ast! {
             match node {
                 ast::LetStmt(it) => {
-                    return it.ascribed_type().is_some()
+                    return it.ty().is_some()
                 },
                 ast::Param(it) => {
-                    return it.ascribed_type().is_some()
+                    return it.ty().is_some()
                 },
                 ast::MatchArm(_it) => {
                     return pat_is_enum_variant(db, bind_pat, pat_ty);
diff --git a/crates/ra_ide/src/references/rename.rs b/crates/ra_ide/src/references/rename.rs
index d330109f1c..31654bf791 100644
--- a/crates/ra_ide/src/references/rename.rs
+++ b/crates/ra_ide/src/references/rename.rs
@@ -7,7 +7,8 @@ use ra_ide_db::{
     RootDatabase,
 };
 use ra_syntax::{
-    algo::find_node_at_offset, ast, ast::NameOwner, ast::TypeAscriptionOwner,
+    algo::find_node_at_offset,
+    ast::{self, NameOwner},
     lex_single_valid_syntax_kind, match_ast, AstNode, SyntaxKind, SyntaxNode, SyntaxToken,
 };
 use ra_text_edit::TextEdit;
@@ -155,7 +156,7 @@ fn rename_to_self(
         return None; // method already has self param
     }
     let first_param = params.params().next()?;
-    let mutable = match first_param.ascribed_type() {
+    let mutable = match first_param.ty() {
         Some(ast::TypeRef::ReferenceType(rt)) => rt.mut_token().is_some(),
         _ => return None, // not renaming other types
     };
diff --git a/crates/ra_syntax/src/ast/generated/nodes.rs b/crates/ra_syntax/src/ast/generated/nodes.rs
index c20ff53bf9..2078269796 100644
--- a/crates/ra_syntax/src/ast/generated/nodes.rs
+++ b/crates/ra_syntax/src/ast/generated/nodes.rs
@@ -35,12 +35,12 @@ pub struct Const {
 impl ast::AttrsOwner for Const {}
 impl ast::NameOwner for Const {}
 impl ast::VisibilityOwner for Const {}
-impl ast::TypeAscriptionOwner for Const {}
 impl Const {
     pub fn default_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![default]) }
     pub fn const_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![const]) }
     pub fn underscore_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![_]) }
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
     pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
     pub fn body(&self) -> Option<Expr> { support::child(&self.syntax) }
     pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
@@ -148,11 +148,11 @@ pub struct Static {
 impl ast::AttrsOwner for Static {}
 impl ast::NameOwner for Static {}
 impl ast::VisibilityOwner for Static {}
-impl ast::TypeAscriptionOwner for Static {}
 impl Static {
     pub fn static_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![static]) }
     pub fn mut_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![mut]) }
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
     pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
     pub fn body(&self) -> Option<Expr> { support::child(&self.syntax) }
     pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
@@ -361,7 +361,6 @@ pub struct SelfParam {
     pub(crate) syntax: SyntaxNode,
 }
 impl ast::AttrsOwner for SelfParam {}
-impl ast::TypeAscriptionOwner for SelfParam {}
 impl SelfParam {
     pub fn amp_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![&]) }
     pub fn lifetime_token(&self) -> Option<SyntaxToken> {
@@ -370,16 +369,17 @@ impl SelfParam {
     pub fn mut_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![mut]) }
     pub fn self_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![self]) }
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct Param {
     pub(crate) syntax: SyntaxNode,
 }
 impl ast::AttrsOwner for Param {}
-impl ast::TypeAscriptionOwner for Param {}
 impl Param {
     pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
     pub fn dotdotdot_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![...]) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -414,9 +414,9 @@ pub struct RecordField {
 impl ast::AttrsOwner for RecordField {}
 impl ast::NameOwner for RecordField {}
 impl ast::VisibilityOwner for RecordField {}
-impl ast::TypeAscriptionOwner for RecordField {}
 impl RecordField {
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct TupleField {
@@ -495,10 +495,10 @@ pub struct ConstParam {
 }
 impl ast::AttrsOwner for ConstParam {}
 impl ast::NameOwner for ConstParam {}
-impl ast::TypeAscriptionOwner for ConstParam {}
 impl ConstParam {
     pub fn const_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![const]) }
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
     pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
     pub fn default_val(&self) -> Option<Expr> { support::child(&self.syntax) }
 }
@@ -1203,11 +1203,11 @@ pub struct LetStmt {
     pub(crate) syntax: SyntaxNode,
 }
 impl ast::AttrsOwner for LetStmt {}
-impl ast::TypeAscriptionOwner for LetStmt {}
 impl LetStmt {
     pub fn let_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![let]) }
     pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
     pub fn colon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![:]) }
+    pub fn ty(&self) -> Option<TypeRef> { support::child(&self.syntax) }
     pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
     pub fn initializer(&self) -> Option<Expr> { support::child(&self.syntax) }
     pub fn semicolon_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![;]) }
diff --git a/crates/ra_syntax/src/ast/traits.rs b/crates/ra_syntax/src/ast/traits.rs
index 113bd5d823..3a56b1674c 100644
--- a/crates/ra_syntax/src/ast/traits.rs
+++ b/crates/ra_syntax/src/ast/traits.rs
@@ -9,12 +9,6 @@ use crate::{
     SyntaxToken, T,
 };
 
-pub trait TypeAscriptionOwner: AstNode {
-    fn ascribed_type(&self) -> Option<ast::TypeRef> {
-        support::child(self.syntax())
-    }
-}
-
 pub trait NameOwner: AstNode {
     fn name(&self) -> Option<ast::Name> {
         support::child(self.syntax())
diff --git a/xtask/src/codegen/gen_syntax.rs b/xtask/src/codegen/gen_syntax.rs
index e993a750c1..45b788bdba 100644
--- a/xtask/src/codegen/gen_syntax.rs
+++ b/xtask/src/codegen/gen_syntax.rs
@@ -660,7 +660,6 @@ fn extract_struct_traits(ast: &mut AstSrc) {
         ("GenericParamsOwner", &["generic_param_list", "where_clause"]),
         ("TypeBoundsOwner", &["type_bound_list", "colon_token"]),
         ("ModuleItemOwner", &["items"]),
-        ("TypeAscriptionOwner", &["ascribed_type"]),
         ("LoopBodyOwner", &["label", "loop_body"]),
         ("ArgListOwner", &["arg_list"]),
     ];
diff --git a/xtask/src/codegen/rust.ungram b/xtask/src/codegen/rust.ungram
index 8c4f953b02..e09bc875a0 100644
--- a/xtask/src/codegen/rust.ungram
+++ b/xtask/src/codegen/rust.ungram
@@ -61,13 +61,13 @@ ParamList =
 SelfParam =
   Attr* (
     ('&' 'lifetime'?)? 'mut'? 'self'
-  | 'mut'? 'self' ':' ascribed_type:TypeRef
+  | 'mut'? 'self' ':' ty:TypeRef
   )
 
 Param =
   Attr* (
-    Pat (':' ascribed_type:TypeRef)
-  | ascribed_type:TypeRef
+    Pat (':' ty:TypeRef)
+  | ty:TypeRef
   | '...'
   )
 
@@ -88,7 +88,7 @@ RecordFieldList =
  '{' fields:(RecordField (',' RecordField)* ','?)? '}'
 
 RecordField =
-  Attr* Visibility? Name ':' ascribed_type:TypeRef
+  Attr* Visibility? Name ':' ty:TypeRef
 
 TupleFieldList =
   '(' fields:(TupleField (',' TupleField)* ','?)? ')'
@@ -115,11 +115,11 @@ Union =
   RecordFieldList
 
 Const =
-  Attr* Visibility? 'default'? 'const' (Name | '_') ':' ascribed_type:TypeRef
+  Attr* Visibility? 'default'? 'const' (Name | '_') ':' ty:TypeRef
   '=' body:Expr ';'
 
 Static =
-  Attr* Visibility? 'static'? 'mut'? Name ':' ascribed_type:TypeRef
+  Attr* Visibility? 'static'? 'mut'? Name ':' ty:TypeRef
   '=' body:Expr ';'
 
 Trait =
@@ -166,7 +166,7 @@ TypeParam =
   ('=' default_type:TypeRef)?
 
 ConstParam =
-  Attr* 'const' Name ':' ascribed_type:TypeRef
+  Attr* 'const' Name ':' ty:TypeRef
   ('=' default_val:Expr)?
 
 LifetimeParam =
@@ -439,7 +439,7 @@ ExprStmt =
   Attr* Expr ';'
 
 LetStmt =
-  Attr* 'let' Pat (':' ascribed_type:TypeRef)
+  Attr* 'let' Pat (':' ty:TypeRef)
   '=' initializer:Expr ';'
 
 Path =