1 files changed, 717 insertions, 0 deletions
diff --git a/src/tools/rust-analyzer/crates/syntax/src/ast/edit_in_place.rs b/src/tools/rust-analyzer/crates/syntax/src/ast/edit_in_place.rs
new file mode 100644
index 000000000..e3e928aec
--- /dev/null
+++ b/src/tools/rust-analyzer/crates/syntax/src/ast/edit_in_place.rs
@@ -0,0 +1,717 @@
+//! Structural editing for ast.
+
+use std::iter::{empty, successors};
+
+use parser::{SyntaxKind, T};
+use rowan::SyntaxElement;
+
+use crate::{
+    algo::{self, neighbor},
+    ast::{self, edit::IndentLevel, make, HasGenericParams},
+    ted::{self, Position},
+    AstNode, AstToken, Direction,
+    SyntaxKind::{ATTR, COMMENT, WHITESPACE},
+    SyntaxNode,
+};
+
+use super::HasName;
+
+pub trait GenericParamsOwnerEdit: ast::HasGenericParams {
+    fn get_or_create_generic_param_list(&self) -> ast::GenericParamList;
+    fn get_or_create_where_clause(&self) -> ast::WhereClause;
+}
+
+impl GenericParamsOwnerEdit for ast::Fn {
+    fn get_or_create_generic_param_list(&self) -> ast::GenericParamList {
+        match self.generic_param_list() {
+            Some(it) => it,
+            None => {
+                let position = if let Some(name) = self.name() {
+                    Position::after(name.syntax)
+                } else if let Some(fn_token) = self.fn_token() {
+                    Position::after(fn_token)
+                } else if let Some(param_list) = self.param_list() {
+                    Position::before(param_list.syntax)
+                } else {
+                    Position::last_child_of(self.syntax())
+                };
+                create_generic_param_list(position)
+            }
+        }
+    }
+
+    fn get_or_create_where_clause(&self) -> ast::WhereClause {
+        if self.where_clause().is_none() {
+            let position = if let Some(ty) = self.ret_type() {
+                Position::after(ty.syntax())
+            } else if let Some(param_list) = self.param_list() {
+                Position::after(param_list.syntax())
+            } else {
+                Position::last_child_of(self.syntax())
+            };
+            create_where_clause(position);
+        }
+        self.where_clause().unwrap()
+    }
+}
+
+impl GenericParamsOwnerEdit for ast::Impl {
+    fn get_or_create_generic_param_list(&self) -> ast::GenericParamList {
+        match self.generic_param_list() {
+            Some(it) => it,
+            None => {
+                let position = match self.impl_token() {
+                    Some(imp_token) => Position::after(imp_token),
+                    None => Position::last_child_of(self.syntax()),
+                };
+                create_generic_param_list(position)
+            }
+        }
+    }
+
+    fn get_or_create_where_clause(&self) -> ast::WhereClause {
+        if self.where_clause().is_none() {
+            let position = match self.assoc_item_list() {
+                Some(items) => Position::before(items.syntax()),
+                None => Position::last_child_of(self.syntax()),
+            };
+            create_where_clause(position);
+        }
+        self.where_clause().unwrap()
+    }
+}
+
+impl GenericParamsOwnerEdit for ast::Trait {
+    fn get_or_create_generic_param_list(&self) -> ast::GenericParamList {
+        match self.generic_param_list() {
+            Some(it) => it,
+            None => {
+                let position = if let Some(name) = self.name() {
+                    Position::after(name.syntax)
+                } else if let Some(trait_token) = self.trait_token() {
+                    Position::after(trait_token)
+                } else {
+                    Position::last_child_of(self.syntax())
+                };
+                create_generic_param_list(position)
+            }
+        }
+    }
+
+    fn get_or_create_where_clause(&self) -> ast::WhereClause {
+        if self.where_clause().is_none() {
+            let position = match self.assoc_item_list() {
+                Some(items) => Position::before(items.syntax()),
+                None => Position::last_child_of(self.syntax()),
+            };
+            create_where_clause(position);
+        }
+        self.where_clause().unwrap()
+    }
+}
+
+impl GenericParamsOwnerEdit for ast::Struct {
+    fn get_or_create_generic_param_list(&self) -> ast::GenericParamList {
+        match self.generic_param_list() {
+            Some(it) => it,
+            None => {
+                let position = if let Some(name) = self.name() {
+                    Position::after(name.syntax)
+                } else if let Some(struct_token) = self.struct_token() {
+                    Position::after(struct_token)
+                } else {
+                    Position::last_child_of(self.syntax())
+                };
+                create_generic_param_list(position)
+            }
+        }
+    }
+
+    fn get_or_create_where_clause(&self) -> ast::WhereClause {
+        if self.where_clause().is_none() {
+            let tfl = self.field_list().and_then(|fl| match fl {
+                ast::FieldList::RecordFieldList(_) => None,
+                ast::FieldList::TupleFieldList(it) => Some(it),
+            });
+            let position = if let Some(tfl) = tfl {
+                Position::after(tfl.syntax())
+            } else if let Some(gpl) = self.generic_param_list() {
+                Position::after(gpl.syntax())
+            } else if let Some(name) = self.name() {
+                Position::after(name.syntax())
+            } else {
+                Position::last_child_of(self.syntax())
+            };
+            create_where_clause(position);
+        }
+        self.where_clause().unwrap()
+    }
+}
+
+impl GenericParamsOwnerEdit for ast::Enum {
+    fn get_or_create_generic_param_list(&self) -> ast::GenericParamList {
+        match self.generic_param_list() {
+            Some(it) => it,
+            None => {
+                let position = if let Some(name) = self.name() {
+                    Position::after(name.syntax)
+                } else if let Some(enum_token) = self.enum_token() {
+                    Position::after(enum_token)
+                } else {
+                    Position::last_child_of(self.syntax())
+                };
+                create_generic_param_list(position)
+            }
+        }
+    }
+
+    fn get_or_create_where_clause(&self) -> ast::WhereClause {
+        if self.where_clause().is_none() {
+            let position = if let Some(gpl) = self.generic_param_list() {
+                Position::after(gpl.syntax())
+            } else if let Some(name) = self.name() {
+                Position::after(name.syntax())
+            } else {
+                Position::last_child_of(self.syntax())
+            };
+            create_where_clause(position);
+        }
+        self.where_clause().unwrap()
+    }
+}
+
+fn create_where_clause(position: Position) {
+    let where_clause = make::where_clause(empty()).clone_for_update();
+    ted::insert(position, where_clause.syntax());
+}
+
+fn create_generic_param_list(position: Position) -> ast::GenericParamList {
+    let gpl = make::generic_param_list(empty()).clone_for_update();
+    ted::insert_raw(position, gpl.syntax());
+    gpl
+}
+
+pub trait AttrsOwnerEdit: ast::HasAttrs {
+    fn remove_attrs_and_docs(&self) {
+        remove_attrs_and_docs(self.syntax());
+
+        fn remove_attrs_and_docs(node: &SyntaxNode) {
+            let mut remove_next_ws = false;
+            for child in node.children_with_tokens() {
+                match child.kind() {
+                    ATTR | COMMENT => {
+                        remove_next_ws = true;
+                        child.detach();
+                        continue;
+                    }
+                    WHITESPACE if remove_next_ws => {
+                        child.detach();
+                    }
+                    _ => (),
+                }
+                remove_next_ws = false;
+            }
+        }
+    }
+}
+
+impl<T: ast::HasAttrs> AttrsOwnerEdit for T {}
+
+impl ast::GenericParamList {
+    pub fn add_generic_param(&self, generic_param: ast::GenericParam) {
+        match self.generic_params().last() {
+            Some(last_param) => {
+                let position = Position::after(last_param.syntax());
+                let elements = vec![
+                    make::token(T![,]).into(),
+                    make::tokens::single_space().into(),
+                    generic_param.syntax().clone().into(),
+                ];
+                ted::insert_all(position, elements);
+            }
+            None => {
+                let after_l_angle = Position::after(self.l_angle_token().unwrap());
+                ted::insert(after_l_angle, generic_param.syntax());
+            }
+        }
+    }
+}
+
+impl ast::WhereClause {
+    pub fn add_predicate(&self, predicate: ast::WherePred) {
+        if let Some(pred) = self.predicates().last() {
+            if !pred.syntax().siblings_with_tokens(Direction::Next).any(|it| it.kind() == T![,]) {
+                ted::append_child_raw(self.syntax(), make::token(T![,]));
+            }
+        }
+        ted::append_child(self.syntax(), predicate.syntax());
+    }
+}
+
+impl ast::TypeBoundList {
+    pub fn remove(&self) {
+        match self.syntax().siblings_with_tokens(Direction::Prev).find(|it| it.kind() == T![:]) {
+            Some(colon) => ted::remove_all(colon..=self.syntax().clone().into()),
+            None => ted::remove(self.syntax()),
+        }
+    }
+}
+
+impl ast::PathSegment {
+    pub fn get_or_create_generic_arg_list(&self) -> ast::GenericArgList {
+        if self.generic_arg_list().is_none() {
+            let arg_list = make::generic_arg_list().clone_for_update();
+            ted::append_child(self.syntax(), arg_list.syntax());
+        }
+        self.generic_arg_list().unwrap()
+    }
+}
+
+impl ast::UseTree {
+    pub fn remove(&self) {
+        for dir in [Direction::Next, Direction::Prev] {
+            if let Some(next_use_tree) = neighbor(self, dir) {
+                let separators = self
+                    .syntax()
+                    .siblings_with_tokens(dir)
+                    .skip(1)
+                    .take_while(|it| it.as_node() != Some(next_use_tree.syntax()));
+                ted::remove_all_iter(separators);
+                break;
+            }
+        }
+        ted::remove(self.syntax());
+    }
+
+    pub fn get_or_create_use_tree_list(&self) -> ast::UseTreeList {
+        match self.use_tree_list() {
+            Some(it) => it,
+            None => {
+                let position = Position::last_child_of(self.syntax());
+                let use_tree_list = make::use_tree_list(empty()).clone_for_update();
+                let mut elements = Vec::with_capacity(2);
+                if self.coloncolon_token().is_none() {
+                    elements.push(make::token(T![::]).into());
+                }
+                elements.push(use_tree_list.syntax().clone().into());
+                ted::insert_all_raw(position, elements);
+                use_tree_list
+            }
+        }
+    }
+
+    /// Splits off the given prefix, making it the path component of the use tree,
+    /// appending the rest of the path to all UseTreeList items.
+    ///
+    /// # Examples
+    ///
+    /// `prefix$0::suffix` -> `prefix::{suffix}`
+    ///
+    /// `prefix$0` -> `prefix::{self}`
+    ///
+    /// `prefix$0::*` -> `prefix::{*}`
+    pub fn split_prefix(&self, prefix: &ast::Path) {
+        debug_assert_eq!(self.path(), Some(prefix.top_path()));
+        let path = self.path().unwrap();
+        if &path == prefix && self.use_tree_list().is_none() {
+            if self.star_token().is_some() {
+                // path$0::* -> *
+                self.coloncolon_token().map(ted::remove);
+                ted::remove(prefix.syntax());
+            } else {
+                // path$0 -> self
+                let self_suffix =
+                    make::path_unqualified(make::path_segment_self()).clone_for_update();
+                ted::replace(path.syntax(), self_suffix.syntax());
+            }
+        } else if split_path_prefix(prefix).is_none() {
+            return;
+        }
+        // At this point, prefix path is detached; _self_ use tree has suffix path.
+        // Next, transform 'suffix' use tree into 'prefix::{suffix}'
+        let subtree = self.clone_subtree().clone_for_update();
+        ted::remove_all_iter(self.syntax().children_with_tokens());
+        ted::insert(Position::first_child_of(self.syntax()), prefix.syntax());
+        self.get_or_create_use_tree_list().add_use_tree(subtree);
+
+        fn split_path_prefix(prefix: &ast::Path) -> Option<()> {
+            let parent = prefix.parent_path()?;
+            let segment = parent.segment()?;
+            if algo::has_errors(segment.syntax()) {
+                return None;
+            }
+            for p in successors(parent.parent_path(), |it| it.parent_path()) {
+                p.segment()?;
+            }
+            prefix.parent_path().and_then(|p| p.coloncolon_token()).map(ted::remove);
+            ted::remove(prefix.syntax());
+            Some(())
+        }
+    }
+}
+
+impl ast::UseTreeList {
+    pub fn add_use_tree(&self, use_tree: ast::UseTree) {
+        let (position, elements) = match self.use_trees().last() {
+            Some(last_tree) => (
+                Position::after(last_tree.syntax()),
+                vec![
+                    make::token(T![,]).into(),
+                    make::tokens::single_space().into(),
+                    use_tree.syntax.into(),
+                ],
+            ),
+            None => {
+                let position = match self.l_curly_token() {
+                    Some(l_curly) => Position::after(l_curly),
+                    None => Position::last_child_of(self.syntax()),
+                };
+                (position, vec![use_tree.syntax.into()])
+            }
+        };
+        ted::insert_all_raw(position, elements);
+    }
+}
+
+impl ast::Use {
+    pub fn remove(&self) {
+        let next_ws = self
+            .syntax()
+            .next_sibling_or_token()
+            .and_then(|it| it.into_token())
+            .and_then(ast::Whitespace::cast);
+        if let Some(next_ws) = next_ws {
+            let ws_text = next_ws.syntax().text();
+            if let Some(rest) = ws_text.strip_prefix('\n') {
+                if rest.is_empty() {
+                    ted::remove(next_ws.syntax());
+                } else {
+                    ted::replace(next_ws.syntax(), make::tokens::whitespace(rest));
+                }
+            }
+        }
+        ted::remove(self.syntax());
+    }
+}
+
+impl ast::Impl {
+    pub fn get_or_create_assoc_item_list(&self) -> ast::AssocItemList {
+        if self.assoc_item_list().is_none() {
+            let assoc_item_list = make::assoc_item_list().clone_for_update();
+            ted::append_child(self.syntax(), assoc_item_list.syntax());
+        }
+        self.assoc_item_list().unwrap()
+    }
+}
+
+impl ast::AssocItemList {
+    pub fn add_item(&self, item: ast::AssocItem) {
+        let (indent, position, whitespace) = match self.assoc_items().last() {
+            Some(last_item) => (
+                IndentLevel::from_node(last_item.syntax()),
+                Position::after(last_item.syntax()),
+                "\n\n",
+            ),
+            None => match self.l_curly_token() {
+                Some(l_curly) => {
+                    normalize_ws_between_braces(self.syntax());
+                    (IndentLevel::from_token(&l_curly) + 1, Position::after(&l_curly), "\n")
+                }
+                None => (IndentLevel::single(), Position::last_child_of(self.syntax()), "\n"),
+            },
+        };
+        let elements: Vec<SyntaxElement<_>> = vec![
+            make::tokens::whitespace(&format!("{}{}", whitespace, indent)).into(),
+            item.syntax().clone().into(),
+        ];
+        ted::insert_all(position, elements);
+    }
+}
+
+impl ast::Fn {
+    pub fn get_or_create_body(&self) -> ast::BlockExpr {
+        if self.body().is_none() {
+            let body = make::ext::empty_block_expr().clone_for_update();
+            match self.semicolon_token() {
+                Some(semi) => {
+                    ted::replace(semi, body.syntax());
+                    ted::insert(Position::before(body.syntax), make::tokens::single_space());
+                }
+                None => ted::append_child(self.syntax(), body.syntax()),
+            }
+        }
+        self.body().unwrap()
+    }
+}
+
+impl ast::MatchArm {
+    pub fn remove(&self) {
+        if let Some(sibling) = self.syntax().prev_sibling_or_token() {
+            if sibling.kind() == SyntaxKind::WHITESPACE {
+                ted::remove(sibling);
+            }
+        }
+        if let Some(sibling) = self.syntax().next_sibling_or_token() {
+            if sibling.kind() == T![,] {
+                ted::remove(sibling);
+            }
+        }
+        ted::remove(self.syntax());
+    }
+}
+
+impl ast::MatchArmList {
+    pub fn add_arm(&self, arm: ast::MatchArm) {
+        normalize_ws_between_braces(self.syntax());
+        let mut elements = Vec::new();
+        let position = match self.arms().last() {
+            Some(last_arm) => {
+                if needs_comma(&last_arm) {
+                    ted::append_child(last_arm.syntax(), make::token(SyntaxKind::COMMA));
+                }
+                Position::after(last_arm.syntax().clone())
+            }
+            None => match self.l_curly_token() {
+                Some(it) => Position::after(it),
+                None => Position::last_child_of(self.syntax()),
+            },
+        };
+        let indent = IndentLevel::from_node(self.syntax()) + 1;
+        elements.push(make::tokens::whitespace(&format!("\n{}", indent)).into());
+        elements.push(arm.syntax().clone().into());
+        if needs_comma(&arm) {
+            ted::append_child(arm.syntax(), make::token(SyntaxKind::COMMA));
+        }
+        ted::insert_all(position, elements);
+
+        fn needs_comma(arm: &ast::MatchArm) -> bool {
+            arm.expr().map_or(false, |e| !e.is_block_like()) && arm.comma_token().is_none()
+        }
+    }
+}
+
+impl ast::RecordExprFieldList {
+    pub fn add_field(&self, field: ast::RecordExprField) {
+        let is_multiline = self.syntax().text().contains_char('\n');
+        let whitespace = if is_multiline {
+            let indent = IndentLevel::from_node(self.syntax()) + 1;
+            make::tokens::whitespace(&format!("\n{}", indent))
+        } else {
+            make::tokens::single_space()
+        };
+
+        if is_multiline {
+            normalize_ws_between_braces(self.syntax());
+        }
+
+        let position = match self.fields().last() {
+            Some(last_field) => {
+                let comma = match last_field
+                    .syntax()
+                    .siblings_with_tokens(Direction::Next)
+                    .filter_map(|it| it.into_token())
+                    .find(|it| it.kind() == T![,])
+                {
+                    Some(it) => it,
+                    None => {
+                        let comma = ast::make::token(T![,]);
+                        ted::insert(Position::after(last_field.syntax()), &comma);
+                        comma
+                    }
+                };
+                Position::after(comma)
+            }
+            None => match self.l_curly_token() {
+                Some(it) => Position::after(it),
+                None => Position::last_child_of(self.syntax()),
+            },
+        };
+
+        ted::insert_all(position, vec![whitespace.into(), field.syntax().clone().into()]);
+        if is_multiline {
+            ted::insert(Position::after(field.syntax()), ast::make::token(T![,]));
+        }
+    }
+}
+
+impl ast::RecordExprField {
+    /// This will either replace the initializer, or in the case that this is a shorthand convert
+    /// the initializer into the name ref and insert the expr as the new initializer.
+    pub fn replace_expr(&self, expr: ast::Expr) {
+        if self.name_ref().is_some() {
+            match self.expr() {
+                Some(prev) => ted::replace(prev.syntax(), expr.syntax()),
+                None => ted::append_child(self.syntax(), expr.syntax()),
+            }
+            return;
+        }
+        // this is a shorthand
+        if let Some(ast::Expr::PathExpr(path_expr)) = self.expr() {
+            if let Some(path) = path_expr.path() {
+                if let Some(name_ref) = path.as_single_name_ref() {
+                    path_expr.syntax().detach();
+                    let children = vec![
+                        name_ref.syntax().clone().into(),
+                        ast::make::token(T![:]).into(),
+                        ast::make::tokens::single_space().into(),
+                        expr.syntax().clone().into(),
+                    ];
+                    ted::insert_all_raw(Position::last_child_of(self.syntax()), children);
+                }
+            }
+        }
+    }
+}
+
+impl ast::RecordPatFieldList {
+    pub fn add_field(&self, field: ast::RecordPatField) {
+        let is_multiline = self.syntax().text().contains_char('\n');
+        let whitespace = if is_multiline {
+            let indent = IndentLevel::from_node(self.syntax()) + 1;
+            make::tokens::whitespace(&format!("\n{}", indent))
+        } else {
+            make::tokens::single_space()
+        };
+
+        if is_multiline {
+            normalize_ws_between_braces(self.syntax());
+        }
+
+        let position = match self.fields().last() {
+            Some(last_field) => {
+                let comma = match last_field
+                    .syntax()
+                    .siblings_with_tokens(Direction::Next)
+                    .filter_map(|it| it.into_token())
+                    .find(|it| it.kind() == T![,])
+                {
+                    Some(it) => it,
+                    None => {
+                        let comma = ast::make::token(T![,]);
+                        ted::insert(Position::after(last_field.syntax()), &comma);
+                        comma
+                    }
+                };
+                Position::after(comma)
+            }
+            None => match self.l_curly_token() {
+                Some(it) => Position::after(it),
+                None => Position::last_child_of(self.syntax()),
+            },
+        };
+
+        ted::insert_all(position, vec![whitespace.into(), field.syntax().clone().into()]);
+        if is_multiline {
+            ted::insert(Position::after(field.syntax()), ast::make::token(T![,]));
+        }
+    }
+}
+impl ast::StmtList {
+    pub fn push_front(&self, statement: ast::Stmt) {
+        ted::insert(Position::after(self.l_curly_token().unwrap()), statement.syntax());
+    }
+}
+
+fn normalize_ws_between_braces(node: &SyntaxNode) -> Option<()> {
+    let l = node
+        .children_with_tokens()
+        .filter_map(|it| it.into_token())
+        .find(|it| it.kind() == T!['{'])?;
+    let r = node
+        .children_with_tokens()
+        .filter_map(|it| it.into_token())
+        .find(|it| it.kind() == T!['}'])?;
+
+    let indent = IndentLevel::from_node(node);
+
+    match l.next_sibling_or_token() {
+        Some(ws) if ws.kind() == SyntaxKind::WHITESPACE => {
+            if ws.next_sibling_or_token()?.into_token()? == r {
+                ted::replace(ws, make::tokens::whitespace(&format!("\n{}", indent)));
+            }
+        }
+        Some(ws) if ws.kind() == T!['}'] => {
+            ted::insert(Position::after(l), make::tokens::whitespace(&format!("\n{}", indent)));
+        }
+        _ => (),
+    }
+    Some(())
+}
+
+pub trait Indent: AstNode + Clone + Sized {
+    fn indent_level(&self) -> IndentLevel {
+        IndentLevel::from_node(self.syntax())
+    }
+    fn indent(&self, by: IndentLevel) {
+        by.increase_indent(self.syntax());
+    }
+    fn dedent(&self, by: IndentLevel) {
+        by.decrease_indent(self.syntax());
+    }
+    fn reindent_to(&self, target_level: IndentLevel) {
+        let current_level = IndentLevel::from_node(self.syntax());
+        self.dedent(current_level);
+        self.indent(target_level);
+    }
+}
+
+impl<N: AstNode + Clone> Indent for N {}
+
+#[cfg(test)]
+mod tests {
+    use std::fmt;
+
+    use crate::SourceFile;
+
+    use super::*;
+
+    fn ast_mut_from_text<N: AstNode>(text: &str) -> N {
+        let parse = SourceFile::parse(text);
+        parse.tree().syntax().descendants().find_map(N::cast).unwrap().clone_for_update()
+    }
+
+    #[test]
+    fn test_create_generic_param_list() {
+        fn check_create_gpl<N: GenericParamsOwnerEdit + fmt::Display>(before: &str, after: &str) {
+            let gpl_owner = ast_mut_from_text::<N>(before);
+            gpl_owner.get_or_create_generic_param_list();
+            assert_eq!(gpl_owner.to_string(), after);
+        }
+
+        check_create_gpl::<ast::Fn>("fn foo", "fn foo<>");
+        check_create_gpl::<ast::Fn>("fn foo() {}", "fn foo<>() {}");
+
+        check_create_gpl::<ast::Impl>("impl", "impl<>");
+        check_create_gpl::<ast::Impl>("impl Struct {}", "impl<> Struct {}");
+        check_create_gpl::<ast::Impl>("impl Trait for Struct {}", "impl<> Trait for Struct {}");
+
+        check_create_gpl::<ast::Trait>("trait Trait<>", "trait Trait<>");
+        check_create_gpl::<ast::Trait>("trait Trait<> {}", "trait Trait<> {}");
+
+        check_create_gpl::<ast::Struct>("struct A", "struct A<>");
+        check_create_gpl::<ast::Struct>("struct A;", "struct A<>;");
+        check_create_gpl::<ast::Struct>("struct A();", "struct A<>();");
+        check_create_gpl::<ast::Struct>("struct A {}", "struct A<> {}");
+
+        check_create_gpl::<ast::Enum>("enum E", "enum E<>");
+        check_create_gpl::<ast::Enum>("enum E {", "enum E<> {");
+    }
+
+    #[test]
+    fn test_increase_indent() {
+        let arm_list = ast_mut_from_text::<ast::Fn>(
+            "fn foo() {
+    ;
+    ;
+}",
+        );
+        arm_list.indent(IndentLevel(2));
+        assert_eq!(
+            arm_list.to_string(),
+            "fn foo() {
+            ;
+            ;
+        }",
+        );
+    }
+}