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Merge #4233

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4233: Remove dead TryBlock expressio r=matklad a=matklad

bors r+
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Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
This commit is contained in:
bors[bot] 2020-04-30 20:59:15 +00:00 committed by GitHub
commit a5f2b16366
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9 changed files with 30 additions and 63 deletions
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4
crates/ra_hir_def/src/body/lower.rs
View file

@ -182,10 +182,6 @@ impl ExprCollector<'_> {
self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr)
}
ast::Expr::TryBlockExpr(e) => {
let body = self.collect_block_opt(e.body());
self.alloc_expr(Expr::TryBlock { body }, syntax_ptr)
}
ast::Expr::BlockExpr(e) => self.collect_block(e),
ast::Expr::LoopExpr(e) => {
let body = self.collect_block_opt(e.loop_body());

4
crates/ra_hir_def/src/expr.rs
View file

@ -101,9 +101,6 @@ pub enum Expr {
Try {
expr: ExprId,
},
TryBlock {
body: ExprId,
},
Cast {
expr: ExprId,
type_ref: TypeRef,
@ -239,7 +236,6 @@ impl Expr {
f(*expr);
}
}
Expr::TryBlock { body } => f(*body),
Expr::Loop { body } => f(*body),
Expr::While { condition, body } => {
f(*condition);

5
crates/ra_hir_ty/src/infer/expr.rs
View file

@ -73,11 +73,6 @@ impl<'a> InferenceContext<'a> {
self.coerce_merge_branch(&then_ty, &else_ty)
}
Expr::Block { statements, tail } => self.infer_block(statements, *tail, expected),
Expr::TryBlock { body } => {
let _inner = self.infer_expr(*body, expected);
// FIXME should be std::result::Result<{inner}, _>
Ty::Unknown
}
Expr::Loop { body } => {
self.infer_expr(*body, &Expectation::has_type(Ty::unit()));
// FIXME handle break with value

6
crates/ra_parser/src/grammar/expressions/atom.rs
View file

@ -84,7 +84,7 @@ pub(super) fn atom_expr(p: &mut Parser, r: Restrictions) -> Option<(CompletedMar
T![box] => box_expr(p, None),
T![for] => for_expr(p, None),
T![while] => while_expr(p, None),
T![try] => try_block_expr(p, None),
T![try] => try_expr(p, None),
LIFETIME if la == T![:] => {
let m = p.start();
label(p);
@ -134,7 +134,7 @@ pub(super) fn atom_expr(p: &mut Parser, r: Restrictions) -> Option<(CompletedMar
}
};
let blocklike = match done.kind() {
IF_EXPR | WHILE_EXPR | FOR_EXPR | LOOP_EXPR | MATCH_EXPR | BLOCK_EXPR | TRY_BLOCK_EXPR => {
IF_EXPR | WHILE_EXPR | FOR_EXPR | LOOP_EXPR | MATCH_EXPR | BLOCK_EXPR | TRY_EXPR => {
BlockLike::Block
}
_ => BlockLike::NotBlock,
@ -532,7 +532,7 @@ fn break_expr(p: &mut Parser, r: Restrictions) -> CompletedMarker {
// fn foo() {
// let _ = try {};
// }
fn try_block_expr(p: &mut Parser, m: Option<Marker>) -> CompletedMarker {
fn try_expr(p: &mut Parser, m: Option<Marker>) -> CompletedMarker {
assert!(p.at(T![try]));
let m = m.unwrap_or_else(|| p.start());
// Special-case `try!` as macro.

1
crates/ra_parser/src/syntax_kind/generated.rs
View file

@ -191,7 +191,6 @@ pub enum SyntaxKind {
RECORD_LIT,
RECORD_FIELD_LIST,
RECORD_FIELD,
TRY_BLOCK_EXPR,
BOX_EXPR,
CALL_EXPR,
INDEX_EXPR,

4
crates/ra_syntax/src/ast.rs
View file

@ -16,7 +16,9 @@ use crate::{
};
pub use self::{
expr_extensions::{ArrayExprKind, BinOp, ElseBranch, LiteralKind, PrefixOp, RangeOp},
expr_extensions::{
ArrayExprKind, BinOp, BlockModifier, ElseBranch, LiteralKind, PrefixOp, RangeOp,
},
extensions::{
AttrKind, FieldKind, NameOrNameRef, PathSegmentKind, SelfParamKind, SlicePatComponents,
StructKind, TypeBoundKind, VisibilityKind,

27
crates/ra_syntax/src/ast/expr_extensions.rs
View file

@ -16,7 +16,7 @@ impl ast::Expr {
| ast::Expr::WhileExpr(_)
| ast::Expr::BlockExpr(_)
| ast::Expr::MatchExpr(_)
| ast::Expr::TryBlockExpr(_) => true,
| ast::Expr::TryExpr(_) => true,
_ => false,
}
}
@ -359,7 +359,22 @@ impl ast::Literal {
}
}
pub enum BlockModifier {
Async(SyntaxToken),
Unsafe(SyntaxToken),
}
impl ast::BlockExpr {
pub fn modifier(&self) -> Option<BlockModifier> {
if let Some(token) = self.async_token() {
return Some(BlockModifier::Async(token));
}
if let Some(token) = self.unsafe_token() {
return Some(BlockModifier::Unsafe(token));
}
None
}
/// false if the block is an intrinsic part of the syntax and can't be
/// replaced with arbitrary expression.
///
@ -368,15 +383,15 @@ impl ast::BlockExpr {
/// const FOO: () = { stand_alone };
/// ```
pub fn is_standalone(&self) -> bool {
if self.unsafe_token().is_some() || self.async_token().is_some() {
if self.modifier().is_some() {
return false;
}
let kind = match self.syntax().parent() {
let parent = match self.syntax().parent() {
Some(it) => it,
None => return true,
Some(it) => it.kind(),
};
match kind {
FN_DEF | IF_EXPR | WHILE_EXPR | LOOP_EXPR | TRY_BLOCK_EXPR => false,
match parent.kind() {
FN_DEF | IF_EXPR | WHILE_EXPR | LOOP_EXPR => false,
_ => true,
}
}

37
crates/ra_syntax/src/ast/generated/nodes.rs
View file

@ -475,16 +475,6 @@ impl LoopExpr {
pub fn loop_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![loop]) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct TryBlockExpr {
pub(crate) syntax: SyntaxNode,
}
impl ast::AttrsOwner for TryBlockExpr {}
impl TryBlockExpr {
pub fn try_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![try]) }
pub fn body(&self) -> Option<BlockExpr> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ForExpr {
pub(crate) syntax: SyntaxNode,
@ -1475,7 +1465,6 @@ pub enum Expr {
FieldExpr(FieldExpr),
AwaitExpr(AwaitExpr),
TryExpr(TryExpr),
TryBlockExpr(TryBlockExpr),
CastExpr(CastExpr),
RefExpr(RefExpr),
PrefixExpr(PrefixExpr),
@ -1958,17 +1947,6 @@ impl AstNode for LoopExpr {
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for TryBlockExpr {
fn can_cast(kind: SyntaxKind) -> bool { kind == TRY_BLOCK_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 ForExpr {
fn can_cast(kind: SyntaxKind) -> bool { kind == FOR_EXPR }
fn cast(syntax: SyntaxNode) -> Option<Self> {
@ -3310,9 +3288,6 @@ impl From<AwaitExpr> for Expr {
impl From<TryExpr> for Expr {
fn from(node: TryExpr) -> Expr { Expr::TryExpr(node) }
}
impl From<TryBlockExpr> for Expr {
fn from(node: TryBlockExpr) -> Expr { Expr::TryBlockExpr(node) }
}
impl From<CastExpr> for Expr {
fn from(node: CastExpr) -> Expr { Expr::CastExpr(node) }
}
@ -3343,9 +3318,8 @@ impl AstNode for Expr {
TUPLE_EXPR | ARRAY_EXPR | PAREN_EXPR | PATH_EXPR | LAMBDA_EXPR | IF_EXPR
| LOOP_EXPR | FOR_EXPR | WHILE_EXPR | CONTINUE_EXPR | BREAK_EXPR | LABEL
| BLOCK_EXPR | RETURN_EXPR | MATCH_EXPR | RECORD_LIT | CALL_EXPR | INDEX_EXPR
| METHOD_CALL_EXPR | FIELD_EXPR | AWAIT_EXPR | TRY_EXPR | TRY_BLOCK_EXPR
| CAST_EXPR | REF_EXPR | PREFIX_EXPR | RANGE_EXPR | BIN_EXPR | LITERAL | MACRO_CALL
| BOX_EXPR => true,
| METHOD_CALL_EXPR | FIELD_EXPR | AWAIT_EXPR | TRY_EXPR | CAST_EXPR | REF_EXPR
| PREFIX_EXPR | RANGE_EXPR | BIN_EXPR | LITERAL | MACRO_CALL | BOX_EXPR => true,
_ => false,
}
}
@ -3373,7 +3347,6 @@ impl AstNode for Expr {
FIELD_EXPR => Expr::FieldExpr(FieldExpr { syntax }),
AWAIT_EXPR => Expr::AwaitExpr(AwaitExpr { syntax }),
TRY_EXPR => Expr::TryExpr(TryExpr { syntax }),
TRY_BLOCK_EXPR => Expr::TryBlockExpr(TryBlockExpr { syntax }),
CAST_EXPR => Expr::CastExpr(CastExpr { syntax }),
REF_EXPR => Expr::RefExpr(RefExpr { syntax }),
PREFIX_EXPR => Expr::PrefixExpr(PrefixExpr { syntax }),
@ -3410,7 +3383,6 @@ impl AstNode for Expr {
Expr::FieldExpr(it) => &it.syntax,
Expr::AwaitExpr(it) => &it.syntax,
Expr::TryExpr(it) => &it.syntax,
Expr::TryBlockExpr(it) => &it.syntax,
Expr::CastExpr(it) => &it.syntax,
Expr::RefExpr(it) => &it.syntax,
Expr::PrefixExpr(it) => &it.syntax,
@ -3891,11 +3863,6 @@ impl std::fmt::Display for LoopExpr {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for TryBlockExpr {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for ForExpr {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)

5
xtask/src/ast_src.rs
View file

@ -162,7 +162,6 @@ pub(crate) const KINDS_SRC: KindsSrc = KindsSrc {
"RECORD_LIT",
"RECORD_FIELD_LIST",
"RECORD_FIELD",
"TRY_BLOCK_EXPR",
"BOX_EXPR",
// postfix
"CALL_EXPR",
@ -440,7 +439,6 @@ pub(crate) const AST_SRC: AstSrc = AstSrc {
}
struct IfExpr: AttrsOwner { T![if], Condition }
struct LoopExpr: AttrsOwner, LoopBodyOwner { T![loop] }
struct TryBlockExpr: AttrsOwner { T![try], body: BlockExpr }
struct ForExpr: AttrsOwner, LoopBodyOwner {
T![for],
Pat,
@ -451,7 +449,7 @@ pub(crate) const AST_SRC: AstSrc = AstSrc {
struct ContinueExpr: AttrsOwner { T![continue], T![lifetime] }
struct BreakExpr: AttrsOwner { T![break], T![lifetime], Expr }
struct Label { T![lifetime] }
struct BlockExpr: AttrsOwner { Label, T![unsafe], T![async], Block }
struct BlockExpr: AttrsOwner { Label, T![unsafe], T![async], Block }
struct ReturnExpr: AttrsOwner { Expr }
struct CallExpr: ArgListOwner { Expr }
struct MethodCallExpr: AttrsOwner, ArgListOwner {
@ -722,7 +720,6 @@ pub(crate) const AST_SRC: AstSrc = AstSrc {
FieldExpr,
AwaitExpr,
TryExpr,
TryBlockExpr,
CastExpr,
RefExpr,
PrefixExpr,