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Merge #11904

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11904: internal: Wrap macros in expr position in `MacroExpr` node r=jonas-schievink a=jonas-schievink

This lets us distinguish them from macros in item position just by looking at the syntax tree.

Fixes https://github.com/rust-analyzer/rust-analyzer/issues/11854

bors r+

Co-authored-by: Jonas Schievink <jonas.schievink@ferrous-systems.com>
This commit is contained in:
bors[bot] 2022-04-05 15:48:09 +00:00 committed by GitHub
commit b5eaf56666
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GPG Key ID: 4AEE18F83AFDEB23
31 changed files with 642 additions and 548 deletions
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4
crates/hir/src/source_analyzer.rs
View File

@ -110,8 +110,8 @@ fn body(&self) -> Option<&Body> {
fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<ExprId> {
let src = match expr {
ast::Expr::MacroCall(call) => {
self.expand_expr(db, InFile::new(self.file_id, call.clone()))?
ast::Expr::MacroExpr(expr) => {
self.expand_expr(db, InFile::new(self.file_id, expr.macro_call()?.clone()))?
}
_ => InFile::new(self.file_id, expr.clone()),
};

9
crates/hir_def/src/body/lower.rs
View File

@ -506,7 +506,8 @@ fn maybe_collect_expr(&mut self, expr: ast::Expr) -> Option<ExprId> {
None => self.alloc_expr(Expr::Missing, syntax_ptr),
}
}
ast::Expr::MacroCall(e) => {
ast::Expr::MacroExpr(e) => {
let e = e.macro_call()?;
let macro_ptr = AstPtr::new(&e);
let id = self.collect_macro_call(e, macro_ptr.clone(), true, |this, expansion| {
expansion.map(|it| this.collect_expr(it))
@ -629,7 +630,11 @@ fn collect_stmt(&mut self, s: ast::Stmt) {
}
let has_semi = stmt.semicolon_token().is_some();
// Note that macro could be expended to multiple statements
if let Some(ast::Expr::MacroCall(m)) = stmt.expr() {
if let Some(ast::Expr::MacroExpr(e)) = stmt.expr() {
let m = match e.macro_call() {
Some(it) => it,
None => return,
};
let macro_ptr = AstPtr::new(&m);
let syntax_ptr = AstPtr::new(&stmt.expr().unwrap());

28
crates/hir_def/src/body/tests.rs
View File

@ -79,6 +79,34 @@ macro_rules! n_nuple {
);
}
#[test]
fn issue_3642_bad_macro_stackover() {
lower(
r#"
#[macro_export]
macro_rules! match_ast {
(match $node:ident { $($tt:tt)* }) => { match_ast!(match ($node) { $($tt)* }) };
(match ($node:expr) {
$( ast::$ast:ident($it:ident) => $res:expr, )*
_ => $catch_all:expr $(,)?
}) => {{
$( if let Some($it) = ast::$ast::cast($node.clone()) { $res } else )*
{ $catch_all }
}};
}
fn main() {
let anchor = match_ast! {
match parent {
as => {},
_ => return None
}
};
}"#,
);
}
#[test]
fn macro_resolve() {
// Regression test for a path resolution bug introduced with inner item handling.

24
crates/hir_def/src/body/tests/block.rs
View File

@ -371,3 +371,27 @@ mod tests {
"#]],
);
}
#[test]
fn stmt_macro_expansion_with_trailing_expr() {
cov_mark::check!(macro_stmt_with_trailing_macro_expr);
check_at(
r#"
macro_rules! mac {
() => { mac!($) };
($x:tt) => { fn inner() {} };
}
fn foo() {
mac!();
$0
}
"#,
expect![[r#"
block scope
inner: v
crate
foo: v
"#]],
)
}

35
crates/hir_def/src/item_tree/lower.rs
View File

@ -48,22 +48,33 @@ pub(super) fn lower_module_items(mut self, item_owner: &dyn HasModuleItem) -> It
pub(super) fn lower_macro_stmts(mut self, stmts: ast::MacroStmts) -> ItemTree {
self.tree.top_level = stmts
.statements()
.filter_map(|stmt| match stmt {
ast::Stmt::Item(item) => Some(item),
// Macro calls can be both items and expressions. The syntax library always treats
// them as expressions here, so we undo that.
ast::Stmt::ExprStmt(es) => match es.expr()? {
ast::Expr::MacroCall(call) => {
cov_mark::hit!(macro_call_in_macro_stmts_is_added_to_item_tree);
Some(call.into())
}
.filter_map(|stmt| {
match stmt {
ast::Stmt::Item(item) => Some(item),
// Macro calls can be both items and expressions. The syntax library always treats
// them as expressions here, so we undo that.
ast::Stmt::ExprStmt(es) => match es.expr()? {
ast::Expr::MacroExpr(expr) => {
cov_mark::hit!(macro_call_in_macro_stmts_is_added_to_item_tree);
Some(expr.macro_call()?.into())
}
_ => None,
},
_ => None,
},
_ => None,
}
})
.flat_map(|item| self.lower_mod_item(&item))
.collect();
if let Some(ast::Expr::MacroExpr(tail_macro)) = stmts.expr() {
if let Some(call) = tail_macro.macro_call() {
cov_mark::hit!(macro_stmt_with_trailing_macro_expr);
if let Some(mod_item) = self.lower_mod_item(&call.into()) {
self.tree.top_level.push(mod_item);
}
}
}
self.tree
}
@ -75,7 +86,7 @@ pub(super) fn lower_block(mut self, block: &ast::BlockExpr) -> ItemTree {
// Macro calls can be both items and expressions. The syntax library always treats
// them as expressions here, so we undo that.
ast::Stmt::ExprStmt(es) => match es.expr()? {
ast::Expr::MacroCall(call) => self.lower_mod_item(&call.into()),
ast::Expr::MacroExpr(expr) => self.lower_mod_item(&expr.macro_call()?.into()),
_ => None,
},
_ => None,

3
crates/hir_def/src/macro_expansion_tests/builtin_fn_macro.rs
View File

@ -249,8 +249,7 @@ macro_rules! format_args {
fn main() {
let _ =
// +errors
format_args!("{} {:?}", a.);
format_args!/*+errors*/("{} {:?}", a.);
}
"#,
expect![[r##"

3
crates/hir_def/src/macro_expansion_tests/mbe.rs
View File

@ -530,8 +530,7 @@ macro_rules! m {
}
fn f() -> i32 {
// +tree
m!{}
m!/*+tree*/{}
}
"#,
expect![[r#"

29
crates/hir_expand/src/lib.rs
View File

@ -885,6 +885,16 @@ pub fn from_call_site(call: &ast::MacroCall) -> ExpandTo {
None => return ExpandTo::Statements,
};
// FIXME: macros in statement position are treated as expression statements, they should
// probably be their own statement kind. The *grand*parent indicates what's valid.
if parent.kind() == MACRO_EXPR
&& parent
.parent()
.map_or(true, |p| matches!(p.kind(), EXPR_STMT | STMT_LIST | MACRO_STMTS))
{
return ExpandTo::Statements;
}
match parent.kind() {
MACRO_ITEMS | SOURCE_FILE | ITEM_LIST => ExpandTo::Items,
MACRO_STMTS | EXPR_STMT | STMT_LIST => ExpandTo::Statements,
@ -895,23 +905,10 @@ pub fn from_call_site(call: &ast::MacroCall) -> ExpandTo {
| CLOSURE_EXPR | FIELD_EXPR | FOR_EXPR | IF_EXPR | INDEX_EXPR | LET_EXPR
| MATCH_ARM | MATCH_EXPR | MATCH_GUARD | METHOD_CALL_EXPR | PAREN_EXPR | PATH_EXPR
| PREFIX_EXPR | RANGE_EXPR | RECORD_EXPR_FIELD | REF_EXPR | RETURN_EXPR | TRY_EXPR
| TUPLE_EXPR | WHILE_EXPR => ExpandTo::Expr,
| TUPLE_EXPR | WHILE_EXPR | MACRO_EXPR => ExpandTo::Expr,
_ => {
match ast::LetStmt::cast(parent) {
Some(let_stmt) => {
if let Some(true) = let_stmt.initializer().map(|it| it.syntax() == syn) {
ExpandTo::Expr
} else if let Some(true) = let_stmt.ty().map(|it| it.syntax() == syn) {
ExpandTo::Type
} else {
ExpandTo::Pattern
}
}
None => {
// Unknown , Just guess it is `Items`
ExpandTo::Items
}
}
// Unknown , Just guess it is `Items`
ExpandTo::Items
}
}
}

28
crates/hir_ty/src/tests/regression.rs
View File

@ -444,34 +444,6 @@ fn test() {
);
}
#[test]
fn issue_3642_bad_macro_stackover() {
check_no_mismatches(
r#"
#[macro_export]
macro_rules! match_ast {
(match $node:ident { $($tt:tt)* }) => { match_ast!(match ($node) { $($tt)* }) };
(match ($node:expr) {
$( ast::$ast:ident($it:ident) => $res:expr, )*
_ => $catch_all:expr $(,)?
}) => {{
$( if let Some($it) = ast::$ast::cast($node.clone()) { $res } else )*
{ $catch_all }
}};
}
fn main() {
let anchor = match_ast! {
match parent {
as => {},
_ => return None
}
};
}"#,
);
}
#[test]
fn issue_3999_slice() {
check_infer(

2
crates/ide/src/highlight_related.rs
View File

@ -156,7 +156,7 @@ fn hl(
highlights.push(HighlightedRange { category: None, range: token.text_range() });
}
}
ast::Expr::MethodCallExpr(_) | ast::Expr::CallExpr(_) | ast::Expr::MacroCall(_) => {
ast::Expr::MethodCallExpr(_) | ast::Expr::CallExpr(_) | ast::Expr::MacroExpr(_) => {
if sema.type_of_expr(&expr).map_or(false, |ty| ty.original.is_never()) {
highlights.push(HighlightedRange {
category: None,

54
crates/ide/src/syntax_tree.rs
View File

@ -163,19 +163,20 @@ fn foo() {
L_CURLY@10..11 "{"
WHITESPACE@11..16 "\n "
EXPR_STMT@16..58
MACRO_CALL@16..57
PATH@16..22
PATH_SEGMENT@16..22
NAME_REF@16..22
IDENT@16..22 "assert"
BANG@22..23 "!"
TOKEN_TREE@23..57
L_PAREN@23..24 "("
STRING@24..52 "\"\n fn foo() {\n ..."
COMMA@52..53 ","
WHITESPACE@53..54 " "
STRING@54..56 "\"\""
R_PAREN@56..57 ")"
MACRO_EXPR@16..57
MACRO_CALL@16..57
PATH@16..22
PATH_SEGMENT@16..22
NAME_REF@16..22
IDENT@16..22 "assert"
BANG@22..23 "!"
TOKEN_TREE@23..57
L_PAREN@23..24 "("
STRING@24..52 "\"\n fn foo() {\n ..."
COMMA@52..53 ","
WHITESPACE@53..54 " "
STRING@54..56 "\"\""
R_PAREN@56..57 ")"
SEMICOLON@57..58 ";"
WHITESPACE@58..59 "\n"
R_CURLY@59..60 "}"
@ -214,19 +215,20 @@ fn foo() {
}"#,
expect![[r#"
EXPR_STMT@16..58
MACRO_CALL@16..57
PATH@16..22
PATH_SEGMENT@16..22
NAME_REF@16..22
IDENT@16..22 "assert"
BANG@22..23 "!"
TOKEN_TREE@23..57
L_PAREN@23..24 "("
STRING@24..52 "\"\n fn foo() {\n ..."
COMMA@52..53 ","
WHITESPACE@53..54 " "
STRING@54..56 "\"\""
R_PAREN@56..57 ")"
MACRO_EXPR@16..57
MACRO_CALL@16..57
PATH@16..22
PATH_SEGMENT@16..22
NAME_REF@16..22
IDENT@16..22 "assert"
BANG@22..23 "!"
TOKEN_TREE@23..57
L_PAREN@23..24 "("
STRING@24..52 "\"\n fn foo() {\n ..."
COMMA@52..53 ","
WHITESPACE@53..54 " "
STRING@54..56 "\"\""
R_PAREN@56..57 ")"
SEMICOLON@57..58 ";"
"#]],
);

11
crates/ide/src/typing.rs
View File

@ -601,6 +601,17 @@ mod m {}
);
}
#[test]
fn noop_in_item_position_with_macro() {
type_char_noop('{', r#"$0println!();"#);
type_char_noop(
'{',
r#"
fn main() $0println!("hello");
}"#,
);
}
#[test]
fn adds_closing_brace_for_use_tree() {
type_char(

2
crates/ide_assists/src/handlers/convert_bool_then.rs
View File

@ -111,7 +111,7 @@ pub(crate) fn convert_if_to_bool_then(acc: &mut Assists, ctx: &AssistContext) ->
| ast::Expr::ForExpr(_)
| ast::Expr::IfExpr(_)
| ast::Expr::LoopExpr(_)
| ast::Expr::MacroCall(_)
| ast::Expr::MacroExpr(_)
| ast::Expr::MatchExpr(_)
| ast::Expr::PrefixExpr(_)
| ast::Expr::RangeExpr(_)

8
crates/ide_assists/src/handlers/extract_function.rs
View File

@ -649,8 +649,8 @@ fn analyze(
ast::Expr::PathExpr(path_expr) => {
cb(path_expr.path().and_then(|it| it.as_single_name_ref()))
}
ast::Expr::MacroCall(call) => {
if let Some(tt) = call.token_tree() {
ast::Expr::MacroExpr(expr) => {
if let Some(tt) = expr.macro_call().and_then(|call| call.token_tree()) {
tt.syntax()
.children_with_tokens()
.flat_map(SyntaxElement::into_token)
@ -923,7 +923,7 @@ fn reference_is_exclusive(
/// checks if this expr requires `&mut` access, recurses on field access
fn expr_require_exclusive_access(ctx: &AssistContext, expr: &ast::Expr) -> Option<bool> {
if let ast::Expr::MacroCall(_) = expr {
if let ast::Expr::MacroExpr(_) = expr {
// FIXME: expand macro and check output for mutable usages of the variable?
return None;
}
@ -1015,7 +1015,7 @@ fn path_element_of_reference(
None
})?;
stdx::always!(
matches!(path, ast::Expr::PathExpr(_) | ast::Expr::MacroCall(_)),
matches!(path, ast::Expr::PathExpr(_) | ast::Expr::MacroExpr(_)),
"unexpected expression type for variable usage: {:?}",
path
);

7
crates/ide_assists/src/handlers/remove_dbg.rs
View File

@ -39,15 +39,16 @@ pub(crate) fn remove_dbg(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
.map(|mut tokens| syntax::hacks::parse_expr_from_str(&tokens.join("")))
.collect::<Option<Vec<ast::Expr>>>()?;
let parent = macro_call.syntax().parent()?;
let macro_expr = ast::MacroExpr::cast(macro_call.syntax().parent()?)?;
let parent = macro_expr.syntax().parent()?;
let (range, text) = match &*input_expressions {
// dbg!()
[] => {
match_ast! {
match parent {
ast::StmtList(__) => {
let range = macro_call.syntax().text_range();
let range = match whitespace_start(macro_call.syntax().prev_sibling_or_token()) {
let range = macro_expr.syntax().text_range();
let range = match whitespace_start(macro_expr.syntax().prev_sibling_or_token()) {
Some(start) => range.cover_offset(start),
None => range,
};

7
crates/ide_db/src/syntax_helpers/node_ext.rs
View File

@ -62,11 +62,6 @@ pub fn preorder_expr(start: &ast::Expr, cb: &mut dyn FnMut(WalkEvent<ast::Expr>)
match ast::Stmt::cast(node.clone()) {
// Don't skip subtree since we want to process the expression child next
Some(ast::Stmt::ExprStmt(_)) | Some(ast::Stmt::LetStmt(_)) => (),
// This might be an expression
Some(ast::Stmt::Item(ast::Item::MacroCall(mcall))) => {
cb(WalkEvent::Enter(ast::Expr::MacroCall(mcall)));
preorder.skip_subtree();
}
// skip inner items which might have their own expressions
Some(ast::Stmt::Item(_)) => preorder.skip_subtree(),
None => {
@ -319,7 +314,7 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
| ast::Expr::ForExpr(_)
| ast::Expr::IndexExpr(_)
| ast::Expr::Literal(_)
| ast::Expr::MacroCall(_)
| ast::Expr::MacroExpr(_)
| ast::Expr::MacroStmts(_)
| ast::Expr::MethodCallExpr(_)
| ast::Expr::ParenExpr(_)

2
crates/parser/src/grammar/expressions.rs
View File

@ -552,7 +552,7 @@ fn path_expr(p: &mut Parser, r: Restrictions) -> (CompletedMarker, BlockLike) {
}
T![!] if !p.at(T![!=]) => {
let block_like = items::macro_call_after_excl(p);
(m.complete(p, MACRO_CALL), block_like)
(m.complete(p, MACRO_CALL).precede(p).complete(p, MACRO_EXPR), block_like)
}
_ => (m.complete(p, PATH_EXPR), BlockLike::NotBlock),
}

4
crates/parser/src/grammar/expressions/atom.rs
View File

@ -605,6 +605,7 @@ fn try_block_expr(p: &mut Parser, m: Option<Marker>) -> CompletedMarker {
if p.nth_at(1, T![!]) {
// test try_macro_fallback
// fn foo() { try!(Ok(())); }
let macro_call = p.start();
let path = p.start();
let path_segment = p.start();
let name_ref = p.start();
@ -613,7 +614,8 @@ fn try_block_expr(p: &mut Parser, m: Option<Marker>) -> CompletedMarker {
path_segment.complete(p, PATH_SEGMENT);
path.complete(p, PATH);
let _block_like = items::macro_call_after_excl(p);
return m.complete(p, MACRO_CALL);
macro_call.complete(p, MACRO_CALL);
return m.complete(p, MACRO_EXPR);
}
p.bump(T![try]);

1
crates/parser/src/syntax_kind/generated.rs
View File

@ -190,6 +190,7 @@ pub enum SyntaxKind {
YIELD_EXPR,
LET_EXPR,
UNDERSCORE_EXPR,
MACRO_EXPR,
MATCH_EXPR,
MATCH_ARM_LIST,
MATCH_ARM,

19
crates/parser/test_data/parser/err/0018_incomplete_fn.rast
View File

@ -104,15 +104,16 @@ SOURCE_FILE
IDENT "entries"
COLON ":"
WHITESPACE " "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "vec"
BANG "!"
TOKEN_TREE
L_BRACK "["
R_BRACK "]"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "vec"
BANG "!"
TOKEN_TREE
L_BRACK "["
R_BRACK "]"
WHITESPACE " "
R_CURLY "}"
R_PAREN ")"

39
crates/parser/test_data/parser/err/0023_mismatched_paren.rast
View File

@ -12,26 +12,27 @@ SOURCE_FILE
STMT_LIST
L_CURLY "{"
WHITESPACE "\n "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "foo"
BANG "!"
WHITESPACE " "
TOKEN_TREE
L_PAREN "("
WHITESPACE "\n "
IDENT "bar"
COMMA ","
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "foo"
BANG "!"
WHITESPACE " "
STRING "\"baz\""
COMMA ","
WHITESPACE " "
INT_NUMBER "1"
COMMA ","
WHITESPACE " "
FLOAT_NUMBER "2.0"
TOKEN_TREE
L_PAREN "("
WHITESPACE "\n "
IDENT "bar"
COMMA ","
WHITESPACE " "
STRING "\"baz\""
COMMA ","
WHITESPACE " "
INT_NUMBER "1"
COMMA ","
WHITESPACE " "
FLOAT_NUMBER "2.0"
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE " "

19
crates/parser/test_data/parser/inline/ok/0053_path_expr.rast
View File

@ -81,15 +81,16 @@ SOURCE_FILE
WHITESPACE " "
EQ "="
WHITESPACE " "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "format"
BANG "!"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "format"
BANG "!"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"

19
crates/parser/test_data/parser/inline/ok/0096_no_semi_after_block.rast
View File

@ -110,15 +110,16 @@ SOURCE_FILE
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "test"
BANG "!"
TOKEN_TREE
L_CURLY "{"
R_CURLY "}"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "test"
BANG "!"
TOKEN_TREE
L_CURLY "{"
R_CURLY "}"
WHITESPACE "\n"
R_CURLY "}"
WHITESPACE "\n"

19
crates/parser/test_data/parser/inline/ok/0126_attr_on_expr_stmt.rast
View File

@ -35,7 +35,7 @@ SOURCE_FILE
SEMICOLON ";"
WHITESPACE "\n "
EXPR_STMT
MACRO_CALL
MACRO_EXPR
ATTR
POUND "#"
L_BRACK "["
@ -46,14 +46,15 @@ SOURCE_FILE
IDENT "B"
R_BRACK "]"
WHITESPACE " "
PATH
PATH_SEGMENT
NAME_REF
IDENT "bar"
BANG "!"
TOKEN_TREE
L_CURLY "{"
R_CURLY "}"
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "bar"
BANG "!"
TOKEN_TREE
L_CURLY "{"
R_CURLY "}"
WHITESPACE "\n "
EXPR_STMT
BLOCK_EXPR

21
crates/parser/test_data/parser/inline/ok/0159_try_macro_fallback.rast
View File

@ -13,22 +13,23 @@ SOURCE_FILE
L_CURLY "{"
WHITESPACE " "
EXPR_STMT
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "try"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "Ok"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "try"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "Ok"
TOKEN_TREE
L_PAREN "("
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE " "
R_CURLY "}"

713
crates/parser/test_data/parser/ok/0035_weird_exprs.rast
View File

@ -396,24 +396,25 @@ SOURCE_FILE
SEMICOLON ";"
WHITESPACE "\n "
EXPR_STMT
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "i"
DOT "."
IDENT "get"
TOKEN_TREE
L_PAREN "("
IDENT "i"
DOT "."
IDENT "get"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"
@ -887,24 +888,7 @@ SOURCE_FILE
PAREN_EXPR
L_PAREN "("
BIN_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
TOKEN_TREE
L_PAREN "("
TRUE_KW "true"
R_PAREN ")"
R_PAREN ")"
WHITESPACE " "
EQ2 "=="
WHITESPACE " "
PAREN_EXPR
L_PAREN "("
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
@ -913,11 +897,30 @@ SOURCE_FILE
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "p"
TOKEN_TREE
L_PAREN "("
TRUE_KW "true"
R_PAREN ")"
R_PAREN ")"
WHITESPACE " "
EQ2 "=="
WHITESPACE " "
PAREN_EXPR
L_PAREN "("
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "p"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
SEMICOLON ";"
@ -934,22 +937,23 @@ SOURCE_FILE
PAREN_EXPR
L_PAREN "("
BIN_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "p"
TOKEN_TREE
L_PAREN "("
IDENT "p"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
WHITESPACE " "
EQ2 "=="
WHITESPACE " "
@ -978,19 +982,20 @@ SOURCE_FILE
PAREN_EXPR
L_PAREN "("
BIN_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "println"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"{}\""
COMMA ","
WHITESPACE " "
INT_NUMBER "0"
R_PAREN ")"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "println"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"{}\""
COMMA ","
WHITESPACE " "
INT_NUMBER "0"
R_PAREN ")"
WHITESPACE " "
EQ2 "=="
WHITESPACE " "
@ -1130,16 +1135,17 @@ SOURCE_FILE
WHITESPACE " "
FAT_ARROW "=>"
WHITESPACE " "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "panic"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"wat\""
R_PAREN ")"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "panic"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"wat\""
R_PAREN ")"
WHITESPACE " "
R_CURLY "}"
WHITESPACE " "
@ -1176,16 +1182,17 @@ SOURCE_FILE
WHITESPACE " "
EQ "="
WHITESPACE " "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "println"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"lincoln\""
R_PAREN ")"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "println"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"lincoln\""
R_PAREN ")"
SEMICOLON ";"
WHITESPACE " "
R_CURLY "}"
@ -1204,107 +1211,108 @@ SOURCE_FILE
L_CURLY "{"
WHITESPACE "\n "
EXPR_STMT
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert_eq"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "String"
COLON ":"
COLON ":"
IDENT "from"
TOKEN_TREE
L_PAREN "("
STRING "\"..................................................\""
R_PAREN ")"
COMMA ","
WHITESPACE "\n "
IDENT "format"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert_eq"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"{:?}\""
IDENT "String"
COLON ":"
COLON ":"
IDENT "from"
TOKEN_TREE
L_PAREN "("
STRING "\"..................................................\""
R_PAREN ")"
COMMA ","
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE "\n "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE "\n "
IDENT "format"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"{:?}\""
COMMA ","
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE "\n "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
WHITESPACE " "
DOT "."
DOT "."
R_PAREN ")"
R_PAREN ")"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"
@ -1353,141 +1361,142 @@ SOURCE_FILE
L_CURLY "{"
WHITESPACE "\n "
EXPR_STMT
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert_eq"
BANG "!"
TOKEN_TREE
L_PAREN "("
INT_NUMBER "8u8"
COMMA ","
WHITESPACE " "
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert_eq"
BANG "!"
TOKEN_TREE
L_CURLY "{"
WHITESPACE "\n "
IDENT "macro_rules"
BANG "!"
WHITESPACE " "
IDENT "u8"
L_PAREN "("
INT_NUMBER "8u8"
COMMA ","
WHITESPACE " "
TOKEN_TREE
L_CURLY "{"
WHITESPACE "\n "
TOKEN_TREE
L_PAREN "("
IDENT "u8"
R_PAREN ")"
WHITESPACE "\n "
IDENT "macro_rules"
BANG "!"
WHITESPACE " "
EQ "="
R_ANGLE ">"
IDENT "u8"
WHITESPACE " "
TOKEN_TREE
L_CURLY "{"
WHITESPACE "\n "
MOD_KW "mod"
WHITESPACE "\n "
TOKEN_TREE
L_PAREN "("
IDENT "u8"
R_PAREN ")"
WHITESPACE " "
IDENT "u8"
EQ "="
R_ANGLE ">"
WHITESPACE " "
TOKEN_TREE
L_CURLY "{"
WHITESPACE "\n "
PUB_KW "pub"
WHITESPACE " "
FN_KW "fn"
WHITESPACE " "
IDENT "u8"
L_ANGLE "<"
LIFETIME_IDENT "'u8"
COLON ":"
WHITESPACE " "
LIFETIME_IDENT "'u8"
WHITESPACE " "
PLUS "+"
WHITESPACE " "
LIFETIME_IDENT "'u8"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
IDENT "u8"
COLON ":"
WHITESPACE " "
AMP "&"
LIFETIME_IDENT "'u8"
WHITESPACE " "
IDENT "u8"
R_PAREN ")"
WHITESPACE " "
MINUS "-"
R_ANGLE ">"
WHITESPACE " "
AMP "&"
LIFETIME_IDENT "'u8"
WHITESPACE "\n "
MOD_KW "mod"
WHITESPACE " "
IDENT "u8"
WHITESPACE " "
TOKEN_TREE
L_CURLY "{"
WHITESPACE "\n "
STRING "\"u8\""
SEMICOLON ";"
WHITESPACE "\n "
IDENT "u8"
WHITESPACE "\n "
PUB_KW "pub"
WHITESPACE " "
FN_KW "fn"
WHITESPACE " "
IDENT "u8"
L_ANGLE "<"
LIFETIME_IDENT "'u8"
COLON ":"
WHITESPACE " "
LIFETIME_IDENT "'u8"
WHITESPACE " "
PLUS "+"
WHITESPACE " "
LIFETIME_IDENT "'u8"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
IDENT "u8"
COLON ":"
WHITESPACE " "
AMP "&"
LIFETIME_IDENT "'u8"
WHITESPACE " "
IDENT "u8"
R_PAREN ")"
WHITESPACE " "
MINUS "-"
R_ANGLE ">"
WHITESPACE " "
AMP "&"
LIFETIME_IDENT "'u8"
WHITESPACE " "
IDENT "u8"
WHITESPACE " "
TOKEN_TREE
L_CURLY "{"
WHITESPACE "\n "
STRING "\"u8\""
SEMICOLON ";"
WHITESPACE "\n "
IDENT "u8"
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n "
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n "
SEMICOLON ";"
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n\n "
IDENT "u8"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "u8"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n\n "
IDENT "u8"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "u8"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
LET_KW "let"
WHITESPACE " "
AMP "&"
IDENT "u8"
COLON ":"
WHITESPACE " "
AMP "&"
IDENT "u8"
WHITESPACE " "
EQ "="
WHITESPACE " "
IDENT "u8"
COLON ":"
COLON ":"
IDENT "u8"
TOKEN_TREE
L_PAREN "("
LET_KW "let"
WHITESPACE " "
AMP "&"
INT_NUMBER "8u8"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
CRATE_KW "crate"
COLON ":"
COLON ":"
IDENT "u8"
TOKEN_TREE
L_PAREN "("
INT_NUMBER "0u8"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
IDENT "u8"
WHITESPACE "\n "
R_CURLY "}"
R_PAREN ")"
IDENT "u8"
COLON ":"
WHITESPACE " "
AMP "&"
IDENT "u8"
WHITESPACE " "
EQ "="
WHITESPACE " "
IDENT "u8"
COLON ":"
COLON ":"
IDENT "u8"
TOKEN_TREE
L_PAREN "("
AMP "&"
INT_NUMBER "8u8"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
CRATE_KW "crate"
COLON ":"
COLON ":"
IDENT "u8"
TOKEN_TREE
L_PAREN "("
INT_NUMBER "0u8"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
IDENT "u8"
WHITESPACE "\n "
R_CURLY "}"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n "
R_CURLY "}"
@ -1508,69 +1517,70 @@ SOURCE_FILE
L_CURLY "{"
WHITESPACE "\n "
EXPR_STMT
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert_eq"
BANG "!"
TOKEN_TREE
L_PAREN "("
IDENT "String"
COLON ":"
COLON ":"
IDENT "from"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert_eq"
BANG "!"
TOKEN_TREE
L_PAREN "("
STRING "\"><>\""
IDENT "String"
COLON ":"
COLON ":"
IDENT "from"
TOKEN_TREE
L_PAREN "("
STRING "\"><>\""
R_PAREN ")"
COMMA ","
WHITESPACE "\n "
IDENT "String"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
COLON ":"
COLON ":"
IDENT "from"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
STRING "\"><>\""
R_PAREN ")"
DOT "."
IDENT "chars"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
DOT "."
IDENT "rev"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
DOT "."
IDENT "collect"
COLON ":"
COLON ":"
L_ANGLE "<"
IDENT "String"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
R_PAREN ")"
COMMA ","
WHITESPACE "\n "
IDENT "String"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
COLON ":"
COLON ":"
IDENT "from"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
STRING "\"><>\""
R_PAREN ")"
DOT "."
IDENT "chars"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
DOT "."
IDENT "rev"
COLON ":"
COLON ":"
L_ANGLE "<"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
DOT "."
IDENT "collect"
COLON ":"
COLON ":"
L_ANGLE "<"
IDENT "String"
R_ANGLE ">"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"
@ -1741,17 +1751,18 @@ SOURCE_FILE
SEMICOLON ";"
WHITESPACE "\n "
EXPR_STMT
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
TOKEN_TREE
L_PAREN "("
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "assert"
BANG "!"
IDENT "val"
R_PAREN ")"
TOKEN_TREE
L_PAREN "("
BANG "!"
IDENT "val"
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"

19
crates/parser/test_data/parser/ok/0042_ufcs_call_list.rast
View File

@ -42,15 +42,16 @@ SOURCE_FILE
STMT_LIST
L_CURLY "{"
WHITESPACE "\n "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "unimplemented"
BANG "!"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "unimplemented"
BANG "!"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
WHITESPACE "\n "
R_CURLY "}"
WHITESPACE "\n"

19
crates/parser/test_data/parser/ok/0071_stmt_attr_placement.rast
View File

@ -38,15 +38,16 @@ SOURCE_FILE
IDENT "B"
R_BRACK "]"
WHITESPACE " "
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "bar"
BANG "!"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
MACRO_EXPR
MACRO_CALL
PATH
PATH_SEGMENT
NAME_REF
IDENT "bar"
BANG "!"
TOKEN_TREE
L_PAREN "("
R_PAREN ")"
QUESTION "?"
WHITESPACE " "
R_CURLY "}"

5
crates/syntax/rust.ungram
View File

@ -342,7 +342,7 @@ Expr =
| IndexExpr
| Literal
| LoopExpr
| MacroCall
| MacroExpr
| MacroStmts
| MatchExpr
| MethodCallExpr
@ -360,6 +360,9 @@ Expr =
| LetExpr
| UnderscoreExpr
MacroExpr =
MacroCall
Literal =
Attr* value:(
'int_number' | 'float_number'

36
crates/syntax/src/ast/generated/nodes.rs
View File

@ -918,6 +918,14 @@ impl LoopExpr {
pub fn loop_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![loop]) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct MacroExpr {
pub(crate) syntax: SyntaxNode,
}
impl MacroExpr {
pub fn macro_call(&self) -> Option<MacroCall> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct MatchExpr {
pub(crate) syntax: SyntaxNode,
@ -1518,7 +1526,7 @@ pub enum Expr {
IndexExpr(IndexExpr),
Literal(Literal),
LoopExpr(LoopExpr),
MacroCall(MacroCall),
MacroExpr(MacroExpr),
MacroStmts(MacroStmts),
MatchExpr(MatchExpr),
MethodCallExpr(MethodCallExpr),
@ -2532,6 +2540,17 @@ fn cast(syntax: SyntaxNode) -> Option<Self> {
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for MacroExpr {
fn can_cast(kind: SyntaxKind) -> bool { kind == MACRO_EXPR }
fn cast(syntax: SyntaxNode) -> Option<Self> {
if Self::can_cast(syntax.kind()) {
Some(Self { syntax })
} else {
None
}
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for MatchExpr {
fn can_cast(kind: SyntaxKind) -> bool { kind == MATCH_EXPR }
fn cast(syntax: SyntaxNode) -> Option<Self> {
@ -3313,8 +3332,8 @@ fn from(node: Literal) -> Expr { Expr::Literal(node) }
impl From<LoopExpr> for Expr {
fn from(node: LoopExpr) -> Expr { Expr::LoopExpr(node) }
}
impl From<MacroCall> for Expr {
fn from(node: MacroCall) -> Expr { Expr::MacroCall(node) }
impl From<MacroExpr> for Expr {
fn from(node: MacroExpr) -> Expr { Expr::MacroExpr(node) }
}
impl From<MacroStmts> for Expr {
fn from(node: MacroStmts) -> Expr { Expr::MacroStmts(node) }
@ -3369,7 +3388,7 @@ fn can_cast(kind: SyntaxKind) -> bool {
match kind {
ARRAY_EXPR | AWAIT_EXPR | BIN_EXPR | BLOCK_EXPR | BOX_EXPR | BREAK_EXPR | CALL_EXPR
| CAST_EXPR | CLOSURE_EXPR | CONTINUE_EXPR | FIELD_EXPR | FOR_EXPR | IF_EXPR
| INDEX_EXPR | LITERAL | LOOP_EXPR | MACRO_CALL | MACRO_STMTS | MATCH_EXPR
| INDEX_EXPR | LITERAL | LOOP_EXPR | MACRO_EXPR | MACRO_STMTS | MATCH_EXPR
| METHOD_CALL_EXPR | PAREN_EXPR | PATH_EXPR | PREFIX_EXPR | RANGE_EXPR
| RECORD_EXPR | REF_EXPR | RETURN_EXPR | TRY_EXPR | TUPLE_EXPR | WHILE_EXPR
| YIELD_EXPR | LET_EXPR | UNDERSCORE_EXPR => true,
@ -3394,7 +3413,7 @@ fn cast(syntax: SyntaxNode) -> Option<Self> {
INDEX_EXPR => Expr::IndexExpr(IndexExpr { syntax }),
LITERAL => Expr::Literal(Literal { syntax }),
LOOP_EXPR => Expr::LoopExpr(LoopExpr { syntax }),
MACRO_CALL => Expr::MacroCall(MacroCall { syntax }),
MACRO_EXPR => Expr::MacroExpr(MacroExpr { syntax }),
MACRO_STMTS => Expr::MacroStmts(MacroStmts { syntax }),
MATCH_EXPR => Expr::MatchExpr(MatchExpr { syntax }),
METHOD_CALL_EXPR => Expr::MethodCallExpr(MethodCallExpr { syntax }),
@ -3433,7 +3452,7 @@ fn syntax(&self) -> &SyntaxNode {
Expr::IndexExpr(it) => &it.syntax,
Expr::Literal(it) => &it.syntax,
Expr::LoopExpr(it) => &it.syntax,
Expr::MacroCall(it) => &it.syntax,
Expr::MacroExpr(it) => &it.syntax,
Expr::MacroStmts(it) => &it.syntax,
Expr::MatchExpr(it) => &it.syntax,
Expr::MethodCallExpr(it) => &it.syntax,
@ -4506,6 +4525,11 @@ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for MacroExpr {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for MatchExpr {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)

1
crates/syntax/src/tests/ast_src.rs
View File

@ -144,6 +144,7 @@ pub(crate) struct KindsSrc<'a> {
"YIELD_EXPR",
"LET_EXPR",
"UNDERSCORE_EXPR",
"MACRO_EXPR",
"MATCH_EXPR",
"MATCH_ARM_LIST",
"MATCH_ARM",