1 //! See `CompletionContext` structure.
3 use hir::{Local, ScopeDef, Semantics, SemanticsScope, Type};
5 base_db::{FilePosition, SourceDatabase},
6 call_info::ActiveParameter,
10 algo::find_node_at_offset,
11 ast::{self, NameOrNameRef, NameOwner},
12 match_ast, AstNode, NodeOrToken,
13 SyntaxKind::{self, *},
14 SyntaxNode, SyntaxToken, TextRange, TextSize, T,
20 determine_location, determine_prev_sibling, for_is_prev2, inside_impl_trait_block,
21 is_in_loop_body, previous_token, ImmediateLocation, ImmediatePrevSibling,
26 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
27 pub(crate) enum PatternRefutability {
32 /// `CompletionContext` is created early during completion to figure out, where
33 /// exactly is the cursor, syntax-wise.
35 pub(crate) struct CompletionContext<'a> {
36 pub(super) sema: Semantics<'a, RootDatabase>,
37 pub(super) scope: SemanticsScope<'a>,
38 pub(super) db: &'a RootDatabase,
39 pub(super) config: &'a CompletionConfig,
40 pub(super) position: FilePosition,
41 /// The token before the cursor, in the original file.
42 pub(super) original_token: SyntaxToken,
43 /// The token before the cursor, in the macro-expanded file.
44 pub(super) token: SyntaxToken,
45 pub(super) krate: Option<hir::Crate>,
46 pub(super) expected_name: Option<NameOrNameRef>,
47 pub(super) expected_type: Option<Type>,
48 pub(super) name_ref_syntax: Option<ast::NameRef>,
50 pub(super) use_item_syntax: Option<ast::Use>,
52 /// The parent function of the cursor position if it exists.
53 pub(super) function_def: Option<ast::Fn>,
54 /// The parent impl of the cursor position if it exists.
55 pub(super) impl_def: Option<ast::Impl>,
57 // potentially set if we are completing a lifetime
58 pub(super) lifetime_syntax: Option<ast::Lifetime>,
59 pub(super) lifetime_param_syntax: Option<ast::LifetimeParam>,
60 pub(super) lifetime_allowed: bool,
61 pub(super) is_label_ref: bool,
63 // potentially set if we are completing a name
64 pub(super) is_pat_or_const: Option<PatternRefutability>,
65 pub(super) is_param: bool,
67 pub(super) completion_location: Option<ImmediateLocation>,
68 pub(super) prev_sibling: Option<ImmediatePrevSibling>,
69 pub(super) attribute_under_caret: Option<ast::Attr>,
71 /// FIXME: `ActiveParameter` is string-based, which is very very wrong
72 pub(super) active_parameter: Option<ActiveParameter>,
73 /// A single-indent path, like `foo`. `::foo` should not be considered a trivial path.
74 pub(super) is_trivial_path: bool,
75 /// If not a trivial path, the prefix (qualifier).
76 pub(super) path_qual: Option<ast::Path>,
77 /// `true` if we are a statement or a last expr in the block.
78 pub(super) can_be_stmt: bool,
79 /// `true` if we expect an expression at the cursor position.
80 pub(super) is_expr: bool,
81 /// Something is typed at the "top" level, in module or impl/trait.
82 pub(super) is_new_item: bool,
83 /// The receiver if this is a field or method access, i.e. writing something.$0
84 pub(super) dot_receiver: Option<ast::Expr>,
85 pub(super) dot_receiver_is_ambiguous_float_literal: bool,
86 /// If this is a call (method or function) in particular, i.e. the () are already there.
87 pub(super) is_call: bool,
88 /// Like `is_call`, but for tuple patterns.
89 pub(super) is_pattern_call: bool,
90 /// If this is a macro call, i.e. the () are already there.
91 pub(super) is_macro_call: bool,
92 pub(super) is_path_type: bool,
93 pub(super) has_type_args: bool,
94 pub(super) locals: Vec<(String, Local)>,
96 pub(super) previous_token: Option<SyntaxToken>,
97 pub(super) in_loop_body: bool,
98 pub(super) incomplete_let: bool,
100 no_completion_required: bool,
103 impl<'a> CompletionContext<'a> {
105 db: &'a RootDatabase,
106 position: FilePosition,
107 config: &'a CompletionConfig,
108 ) -> Option<CompletionContext<'a>> {
109 let sema = Semantics::new(db);
111 let original_file = sema.parse(position.file_id);
113 // Insert a fake ident to get a valid parse tree. We will use this file
114 // to determine context, though the original_file will be used for
115 // actual completion.
116 let file_with_fake_ident = {
117 let parse = db.parse(position.file_id);
118 let edit = Indel::insert(position.offset, "intellijRulezz".to_string());
119 parse.reparse(&edit).tree()
121 let fake_ident_token =
122 file_with_fake_ident.syntax().token_at_offset(position.offset).right_biased().unwrap();
124 let krate = sema.to_module_def(position.file_id).map(|m| m.krate());
126 original_file.syntax().token_at_offset(position.offset).left_biased()?;
127 let token = sema.descend_into_macros(original_token.clone());
128 let scope = sema.scope_at_offset(&token, position.offset);
129 let mut locals = vec![];
130 scope.process_all_names(&mut |name, scope| {
131 if let ScopeDef::Local(local) = scope {
132 locals.push((name.to_string(), local));
135 let mut ctx = CompletionContext {
144 lifetime_allowed: false,
147 name_ref_syntax: None,
148 lifetime_syntax: None,
149 lifetime_param_syntax: None,
151 use_item_syntax: None,
153 active_parameter: ActiveParameter::at(db, position),
156 is_pat_or_const: None,
157 is_trivial_path: false,
163 dot_receiver_is_ambiguous_float_literal: false,
165 is_pattern_call: false,
166 is_macro_call: false,
168 has_type_args: false,
169 previous_token: None,
171 completion_location: None,
173 no_completion_required: false,
174 incomplete_let: false,
175 attribute_under_caret: None,
179 let mut original_file = original_file.syntax().clone();
180 let mut speculative_file = file_with_fake_ident.syntax().clone();
181 let mut offset = position.offset;
182 let mut fake_ident_token = fake_ident_token;
184 // Are we inside a macro call?
185 while let (Some(actual_macro_call), Some(macro_call_with_fake_ident)) = (
186 find_node_at_offset::<ast::MacroCall>(&original_file, offset),
187 find_node_at_offset::<ast::MacroCall>(&speculative_file, offset),
189 if actual_macro_call.path().as_ref().map(|s| s.syntax().text())
190 != macro_call_with_fake_ident.path().as_ref().map(|s| s.syntax().text())
194 let speculative_args = match macro_call_with_fake_ident.token_tree() {
198 if let (Some(actual_expansion), Some(speculative_expansion)) = (
199 ctx.sema.expand(&actual_macro_call),
200 ctx.sema.speculative_expand(
206 let new_offset = speculative_expansion.1.text_range().start();
207 if new_offset > actual_expansion.text_range().end() {
210 original_file = actual_expansion;
211 speculative_file = speculative_expansion.0;
212 fake_ident_token = speculative_expansion.1;
218 ctx.fill(&original_file, speculative_file, offset);
222 /// Checks whether completions in that particular case don't make much sense.
224 /// - `fn $0` -- we expect function name, it's unlikely that "hint" will be helpful.
225 /// Exception for this case is `impl Trait for Foo`, where we would like to hint trait method names.
226 /// - `for _ i$0` -- obviously, it'll be "in" keyword.
227 pub(crate) fn no_completion_required(&self) -> bool {
228 self.no_completion_required
231 /// The range of the identifier that is being completed.
232 pub(crate) fn source_range(&self) -> TextRange {
233 // check kind of macro-expanded token, but use range of original token
234 let kind = self.token.kind();
235 if kind == IDENT || kind == LIFETIME_IDENT || kind == UNDERSCORE || kind.is_keyword() {
236 cov_mark::hit!(completes_if_prefix_is_keyword);
237 self.original_token.text_range()
238 } else if kind == CHAR {
239 // assume we are completing a lifetime but the user has only typed the '
240 cov_mark::hit!(completes_if_lifetime_without_idents);
241 TextRange::at(self.original_token.text_range().start(), TextSize::from(1))
243 TextRange::empty(self.position.offset)
247 pub(crate) fn previous_token_is(&self, kind: SyntaxKind) -> bool {
248 self.previous_token.as_ref().map_or(false, |tok| tok.kind() == kind)
251 pub(crate) fn expects_assoc_item(&self) -> bool {
253 self.completion_location,
254 Some(ImmediateLocation::Trait) | Some(ImmediateLocation::Impl)
258 pub(crate) fn expects_use_tree(&self) -> bool {
259 matches!(self.completion_location, Some(ImmediateLocation::Use))
262 pub(crate) fn expects_non_trait_assoc_item(&self) -> bool {
263 matches!(self.completion_location, Some(ImmediateLocation::Impl))
266 pub(crate) fn expects_item(&self) -> bool {
267 matches!(self.completion_location, Some(ImmediateLocation::ItemList))
270 pub(crate) fn expects_expression(&self) -> bool {
274 pub(crate) fn has_block_expr_parent(&self) -> bool {
275 matches!(self.completion_location, Some(ImmediateLocation::BlockExpr))
278 pub(crate) fn expects_ident_pat_or_ref_expr(&self) -> bool {
280 self.completion_location,
281 Some(ImmediateLocation::IdentPat) | Some(ImmediateLocation::RefExpr)
285 pub(crate) fn expect_record_field(&self) -> bool {
286 matches!(self.completion_location, Some(ImmediateLocation::RecordField))
289 pub(crate) fn has_impl_or_trait_prev_sibling(&self) -> bool {
292 Some(ImmediatePrevSibling::ImplDefType) | Some(ImmediatePrevSibling::TraitDefName)
296 pub(crate) fn after_if(&self) -> bool {
297 matches!(self.prev_sibling, Some(ImmediatePrevSibling::IfExpr))
300 pub(crate) fn is_path_disallowed(&self) -> bool {
302 self.completion_location,
303 Some(ImmediateLocation::Attribute(_))
304 | Some(ImmediateLocation::ModDeclaration(_))
305 | Some(ImmediateLocation::RecordPat(_))
306 | Some(ImmediateLocation::RecordExpr(_))
307 ) || self.attribute_under_caret.is_some()
310 fn fill_impl_def(&mut self) {
313 .token_ancestors_with_macros(self.token.clone())
314 .take_while(|it| it.kind() != SOURCE_FILE && it.kind() != MODULE)
315 .find_map(ast::Impl::cast);
318 fn expected_type_and_name(&self) -> (Option<Type>, Option<NameOrNameRef>) {
319 let mut node = match self.token.parent() {
321 None => return (None, None),
326 ast::LetStmt(it) => {
327 cov_mark::hit!(expected_type_let_with_leading_char);
328 cov_mark::hit!(expected_type_let_without_leading_char);
330 .and_then(|pat| self.sema.type_of_pat(&pat))
331 .or_else(|| it.initializer().and_then(|it| self.sema.type_of_expr(&it)));
332 let name = if let Some(ast::Pat::IdentPat(ident)) = it.pat() {
333 ident.name().map(NameOrNameRef::Name)
340 ast::ArgList(_it) => {
341 cov_mark::hit!(expected_type_fn_param_with_leading_char);
342 cov_mark::hit!(expected_type_fn_param_without_leading_char);
343 ActiveParameter::at_token(
347 let name = ap.ident().map(NameOrNameRef::Name);
350 .unwrap_or((None, None))
352 ast::RecordExprFieldList(_it) => {
353 cov_mark::hit!(expected_type_struct_field_without_leading_char);
354 // wouldn't try {} be nice...
356 let expr_field = self.token.prev_sibling_or_token()?
358 .and_then(|node| ast::RecordExprField::cast(node))?;
359 let (_, _, ty) = self.sema.resolve_record_field(&expr_field)?;
362 expr_field.field_name().map(NameOrNameRef::NameRef),
364 })().unwrap_or((None, None))
366 ast::RecordExprField(it) => {
367 cov_mark::hit!(expected_type_struct_field_with_leading_char);
369 it.expr().as_ref().and_then(|e| self.sema.type_of_expr(e)),
370 it.field_name().map(NameOrNameRef::NameRef),
373 ast::MatchExpr(it) => {
374 cov_mark::hit!(expected_type_match_arm_without_leading_char);
376 .and_then(|e| self.sema.type_of_expr(&e));
380 cov_mark::hit!(expected_type_if_let_without_leading_char);
381 let ty = it.condition()
382 .and_then(|cond| cond.expr())
383 .and_then(|e| self.sema.type_of_expr(&e));
386 ast::IdentPat(it) => {
387 cov_mark::hit!(expected_type_if_let_with_leading_char);
388 cov_mark::hit!(expected_type_match_arm_with_leading_char);
389 let ty = self.sema.type_of_pat(&ast::Pat::from(it));
393 cov_mark::hit!(expected_type_fn_ret_with_leading_char);
394 cov_mark::hit!(expected_type_fn_ret_without_leading_char);
395 let def = self.sema.to_def(&it);
396 (def.map(|def| def.ret_type(self.db)), None)
398 ast::ClosureExpr(it) => {
399 let ty = self.sema.type_of_expr(&it.into());
400 ty.and_then(|ty| ty.as_callable(self.db))
401 .map(|c| (Some(c.return_type()), None))
402 .unwrap_or((None, None))
404 ast::Stmt(_it) => (None, None),
406 match node.parent() {
411 None => (None, None),
421 original_file: &SyntaxNode,
422 file_with_fake_ident: SyntaxNode,
425 let fake_ident_token = file_with_fake_ident.token_at_offset(offset).right_biased().unwrap();
426 let syntax_element = NodeOrToken::Token(fake_ident_token);
427 self.previous_token = previous_token(syntax_element.clone());
428 self.attribute_under_caret = syntax_element.ancestors().find_map(ast::Attr::cast);
429 self.no_completion_required = {
430 let inside_impl_trait_block = inside_impl_trait_block(syntax_element.clone());
431 let fn_is_prev = self.previous_token_is(T![fn]);
432 let for_is_prev2 = for_is_prev2(syntax_element.clone());
433 (fn_is_prev && !inside_impl_trait_block) || for_is_prev2
435 self.in_loop_body = is_in_loop_body(syntax_element.clone());
437 self.incomplete_let =
438 syntax_element.ancestors().take(6).find_map(ast::LetStmt::cast).map_or(false, |it| {
439 it.syntax().text_range().end() == syntax_element.text_range().end()
442 let (expected_type, expected_name) = self.expected_type_and_name();
443 self.expected_type = expected_type;
444 self.expected_name = expected_name;
446 let name_like = match find_node_at_offset(&&file_with_fake_ident, offset) {
450 self.completion_location =
451 determine_location(&self.sema, original_file, offset, &name_like);
452 self.prev_sibling = determine_prev_sibling(&name_like);
454 ast::NameLike::Lifetime(lifetime) => {
455 self.classify_lifetime(original_file, lifetime, offset);
457 ast::NameLike::NameRef(name_ref) => {
458 self.classify_name_ref(original_file, name_ref);
460 ast::NameLike::Name(name) => {
461 self.classify_name(name);
466 fn classify_lifetime(
468 original_file: &SyntaxNode,
469 lifetime: ast::Lifetime,
472 self.lifetime_syntax =
473 find_node_at_offset(original_file, lifetime.syntax().text_range().start());
474 if let Some(parent) = lifetime.syntax().parent() {
475 if parent.kind() == ERROR {
481 ast::LifetimeParam(_it) => {
482 self.lifetime_allowed = true;
483 self.lifetime_param_syntax =
484 self.sema.find_node_at_offset_with_macros(original_file, offset);
486 ast::BreakExpr(_it) => self.is_label_ref = true,
487 ast::ContinueExpr(_it) => self.is_label_ref = true,
488 ast::Label(_it) => (),
489 _ => self.lifetime_allowed = true,
495 fn classify_name(&mut self, name: ast::Name) {
496 if let Some(bind_pat) = name.syntax().parent().and_then(ast::IdentPat::cast) {
497 self.is_pat_or_const = Some(PatternRefutability::Refutable);
498 // if any of these is here our bind pat can't be a const pat anymore
499 let complex_ident_pat = bind_pat.at_token().is_some()
500 || bind_pat.ref_token().is_some()
501 || bind_pat.mut_token().is_some();
502 if complex_ident_pat {
503 self.is_pat_or_const = None;
505 let irrefutable_pat = bind_pat.syntax().ancestors().find_map(|node| {
508 ast::LetStmt(it) => Some(it.pat()),
509 ast::Param(it) => Some(it.pat()),
514 if let Some(Some(pat)) = irrefutable_pat {
515 // This check is here since we could be inside a pattern in the initializer expression of the let statement.
516 if pat.syntax().text_range().contains_range(bind_pat.syntax().text_range()) {
517 self.is_pat_or_const = Some(PatternRefutability::Irrefutable);
521 let is_name_in_field_pat = bind_pat
524 .and_then(ast::RecordPatField::cast)
525 .map_or(false, |pat_field| pat_field.name_ref().is_none());
526 if is_name_in_field_pat {
527 self.is_pat_or_const = None;
531 self.fill_impl_def();
534 self.is_param |= is_node::<ast::Param>(name.syntax());
537 fn classify_name_ref(&mut self, original_file: &SyntaxNode, name_ref: ast::NameRef) {
538 self.fill_impl_def();
540 self.name_ref_syntax =
541 find_node_at_offset(original_file, name_ref.syntax().text_range().start());
543 let name_range = name_ref.syntax().text_range();
544 let top_node = name_ref
547 .take_while(|it| it.text_range() == name_range)
551 if matches!(top_node.parent().map(|it| it.kind()), Some(SOURCE_FILE) | Some(ITEM_LIST)) {
552 self.is_new_item = true;
556 self.use_item_syntax =
557 self.sema.token_ancestors_with_macros(self.token.clone()).find_map(ast::Use::cast);
559 self.function_def = self
561 .token_ancestors_with_macros(self.token.clone())
562 .take_while(|it| it.kind() != SOURCE_FILE && it.kind() != MODULE)
563 .find_map(ast::Fn::cast);
565 let parent = match name_ref.syntax().parent() {
570 if let Some(segment) = ast::PathSegment::cast(parent.clone()) {
571 let path = segment.parent_path();
575 .and_then(ast::PathExpr::cast)
576 .and_then(|it| it.syntax().parent().and_then(ast::CallExpr::cast))
578 self.is_macro_call = path.syntax().parent().and_then(ast::MacroCall::cast).is_some();
579 self.is_pattern_call =
580 path.syntax().parent().and_then(ast::TupleStructPat::cast).is_some();
582 self.is_path_type = path.syntax().parent().and_then(ast::PathType::cast).is_some();
583 self.has_type_args = segment.generic_arg_list().is_some();
585 if let Some(path) = path_or_use_tree_qualifier(&path) {
586 self.path_qual = path
589 find_node_with_range::<ast::PathSegment>(
591 it.syntax().text_range(),
594 .map(|it| it.parent_path());
598 if let Some(segment) = path.segment() {
599 if segment.coloncolon_token().is_some() {
604 self.is_trivial_path = true;
606 // Find either enclosing expr statement (thing with `;`) or a
607 // block. If block, check that we are the last expr.
608 self.can_be_stmt = name_ref
612 if let Some(stmt) = ast::ExprStmt::cast(node.clone()) {
613 return Some(stmt.syntax().text_range() == name_ref.syntax().text_range());
615 if let Some(block) = ast::BlockExpr::cast(node) {
617 block.tail_expr().map(|e| e.syntax().text_range())
618 == Some(name_ref.syntax().text_range()),
624 self.is_expr = path.syntax().parent().and_then(ast::PathExpr::cast).is_some();
627 if let Some(field_expr) = ast::FieldExpr::cast(parent.clone()) {
628 // The receiver comes before the point of insertion of the fake
629 // ident, so it should have the same range in the non-modified file
630 self.dot_receiver = field_expr
632 .map(|e| e.syntax().text_range())
633 .and_then(|r| find_node_with_range(original_file, r));
634 self.dot_receiver_is_ambiguous_float_literal =
635 if let Some(ast::Expr::Literal(l)) = &self.dot_receiver {
637 ast::LiteralKind::FloatNumber { .. } => l.token().text().ends_with('.'),
645 if let Some(method_call_expr) = ast::MethodCallExpr::cast(parent) {
647 self.dot_receiver = method_call_expr
649 .map(|e| e.syntax().text_range())
650 .and_then(|r| find_node_with_range(original_file, r));
656 fn find_node_with_range<N: AstNode>(syntax: &SyntaxNode, range: TextRange) -> Option<N> {
657 syntax.covering_element(range).ancestors().find_map(N::cast)
660 fn is_node<N: AstNode>(node: &SyntaxNode) -> bool {
661 match node.ancestors().find_map(N::cast) {
663 Some(n) => n.syntax().text_range() == node.text_range(),
667 fn path_or_use_tree_qualifier(path: &ast::Path) -> Option<ast::Path> {
668 if let Some(qual) = path.qualifier() {
671 let use_tree_list = path.syntax().ancestors().find_map(ast::UseTreeList::cast)?;
672 let use_tree = use_tree_list.syntax().parent().and_then(ast::UseTree::cast)?;
678 use expect_test::{expect, Expect};
681 use crate::test_utils::{position, TEST_CONFIG};
683 use super::CompletionContext;
685 fn check_expected_type_and_name(ra_fixture: &str, expect: Expect) {
686 let (db, pos) = position(ra_fixture);
687 let completion_context = CompletionContext::new(&db, pos, &TEST_CONFIG).unwrap();
689 let ty = completion_context
691 .map(|t| t.display_test(&db).to_string())
692 .unwrap_or("?".to_owned());
694 let name = completion_context
696 .map_or_else(|| "?".to_owned(), |name| name.to_string());
698 expect.assert_eq(&format!("ty: {}, name: {}", ty, name));
702 fn expected_type_let_without_leading_char() {
703 cov_mark::check!(expected_type_let_without_leading_char);
704 check_expected_type_and_name(
710 expect![[r#"ty: u32, name: x"#]],
715 fn expected_type_let_with_leading_char() {
716 cov_mark::check!(expected_type_let_with_leading_char);
717 check_expected_type_and_name(
723 expect![[r#"ty: u32, name: x"#]],
728 fn expected_type_let_pat() {
729 check_expected_type_and_name(
735 expect![[r#"ty: u32, name: ?"#]],
737 check_expected_type_and_name(
743 expect![[r#"ty: u32, name: ?"#]],
748 fn expected_type_fn_param_without_leading_char() {
749 cov_mark::check!(expected_type_fn_param_without_leading_char);
750 check_expected_type_and_name(
758 expect![[r#"ty: u32, name: x"#]],
763 fn expected_type_fn_param_with_leading_char() {
764 cov_mark::check!(expected_type_fn_param_with_leading_char);
765 check_expected_type_and_name(
773 expect![[r#"ty: u32, name: x"#]],
778 fn expected_type_struct_field_without_leading_char() {
779 cov_mark::check!(expected_type_struct_field_without_leading_char);
780 check_expected_type_and_name(
782 struct Foo { a: u32 }
787 expect![[r#"ty: u32, name: a"#]],
792 fn expected_type_generic_struct_field() {
793 check_expected_type_and_name(
795 struct Foo<T> { a: T }
796 fn foo() -> Foo<u32> {
800 expect![[r#"ty: u32, name: a"#]],
805 fn expected_type_struct_field_with_leading_char() {
806 cov_mark::check!(expected_type_struct_field_with_leading_char);
807 check_expected_type_and_name(
809 struct Foo { a: u32 }
814 expect![[r#"ty: u32, name: a"#]],
819 fn expected_type_match_arm_without_leading_char() {
820 cov_mark::check!(expected_type_match_arm_without_leading_char);
821 check_expected_type_and_name(
828 expect![[r#"ty: E, name: ?"#]],
833 fn expected_type_match_arm_with_leading_char() {
834 cov_mark::check!(expected_type_match_arm_with_leading_char);
835 check_expected_type_and_name(
842 expect![[r#"ty: E, name: ?"#]],
847 fn expected_type_if_let_without_leading_char() {
848 cov_mark::check!(expected_type_if_let_without_leading_char);
849 check_expected_type_and_name(
851 enum Foo { Bar, Baz, Quux }
858 expect![[r#"ty: Foo, name: ?"#]],
863 fn expected_type_if_let_with_leading_char() {
864 cov_mark::check!(expected_type_if_let_with_leading_char);
865 check_expected_type_and_name(
867 enum Foo { Bar, Baz, Quux }
874 expect![[r#"ty: Foo, name: ?"#]],
879 fn expected_type_fn_ret_without_leading_char() {
880 cov_mark::check!(expected_type_fn_ret_without_leading_char);
881 check_expected_type_and_name(
887 expect![[r#"ty: u32, name: ?"#]],
892 fn expected_type_fn_ret_with_leading_char() {
893 cov_mark::check!(expected_type_fn_ret_with_leading_char);
894 check_expected_type_and_name(
900 expect![[r#"ty: u32, name: ?"#]],
905 fn expected_type_fn_ret_fn_ref_fully_typed() {
906 check_expected_type_and_name(
912 expect![[r#"ty: u32, name: ?"#]],
917 fn expected_type_closure_param_return() {
918 // FIXME: make this work with `|| $0`
919 check_expected_type_and_name(
925 fn bar(f: impl FnOnce() -> u32) {}
927 trait FnOnce { type Output; }
929 expect![[r#"ty: u32, name: ?"#]],
934 fn expected_type_generic_function() {
935 check_expected_type_and_name(
943 expect![[r#"ty: u32, name: t"#]],
948 fn expected_type_generic_method() {
949 check_expected_type_and_name(
957 fn bar(self, t: T) {}
960 expect![[r#"ty: u32, name: t"#]],