621 lines
20 KiB
Rust
621 lines
20 KiB
Rust
//! Format match expression.
|
|
|
|
use std::iter::repeat;
|
|
|
|
use rustc_ast::{ast, ptr};
|
|
use rustc_span::{BytePos, Span};
|
|
|
|
use crate::comment::{combine_strs_with_missing_comments, rewrite_comment, FindUncommented};
|
|
use crate::config::lists::*;
|
|
use crate::config::{Config, ControlBraceStyle, IndentStyle, MatchArmLeadingPipe, Version};
|
|
use crate::expr::{
|
|
format_expr, is_empty_block, is_simple_block, is_unsafe_block, prefer_next_line, rewrite_cond,
|
|
ExprType, RhsTactics,
|
|
};
|
|
use crate::lists::{itemize_list, write_list, ListFormatting};
|
|
use crate::rewrite::{Rewrite, RewriteContext};
|
|
use crate::shape::Shape;
|
|
use crate::source_map::SpanUtils;
|
|
use crate::spanned::Spanned;
|
|
use crate::utils::{
|
|
contains_skip, extra_offset, first_line_width, inner_attributes, last_line_extendable, mk_sp,
|
|
semicolon_for_expr, trimmed_last_line_width, unicode_str_width,
|
|
};
|
|
|
|
/// A simple wrapper type against `ast::Arm`. Used inside `write_list()`.
|
|
struct ArmWrapper<'a> {
|
|
arm: &'a ast::Arm,
|
|
/// `true` if the arm is the last one in match expression. Used to decide on whether we should
|
|
/// add trailing comma to the match arm when `config.trailing_comma() == Never`.
|
|
is_last: bool,
|
|
/// Holds a byte position of `|` at the beginning of the arm pattern, if available.
|
|
beginning_vert: Option<BytePos>,
|
|
}
|
|
|
|
impl<'a> ArmWrapper<'a> {
|
|
fn new(arm: &'a ast::Arm, is_last: bool, beginning_vert: Option<BytePos>) -> ArmWrapper<'a> {
|
|
ArmWrapper {
|
|
arm,
|
|
is_last,
|
|
beginning_vert,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> Spanned for ArmWrapper<'a> {
|
|
fn span(&self) -> Span {
|
|
if let Some(lo) = self.beginning_vert {
|
|
let lo = std::cmp::min(lo, self.arm.span().lo());
|
|
mk_sp(lo, self.arm.span().hi())
|
|
} else {
|
|
self.arm.span()
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> Rewrite for ArmWrapper<'a> {
|
|
fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
|
|
rewrite_match_arm(
|
|
context,
|
|
self.arm,
|
|
shape,
|
|
self.is_last,
|
|
self.beginning_vert.is_some(),
|
|
)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn rewrite_match(
|
|
context: &RewriteContext<'_>,
|
|
cond: &ast::Expr,
|
|
arms: &[ast::Arm],
|
|
shape: Shape,
|
|
span: Span,
|
|
attrs: &[ast::Attribute],
|
|
) -> Option<String> {
|
|
// Do not take the rhs overhead from the upper expressions into account
|
|
// when rewriting match condition.
|
|
let cond_shape = Shape {
|
|
width: context.budget(shape.used_width()),
|
|
..shape
|
|
};
|
|
// 6 = `match `
|
|
let cond_shape = match context.config.indent_style() {
|
|
IndentStyle::Visual => cond_shape.shrink_left(6)?,
|
|
IndentStyle::Block => cond_shape.offset_left(6)?,
|
|
};
|
|
let cond_str = cond.rewrite(context, cond_shape)?;
|
|
let alt_block_sep = &shape.indent.to_string_with_newline(context.config);
|
|
let block_sep = match context.config.control_brace_style() {
|
|
ControlBraceStyle::AlwaysNextLine => alt_block_sep,
|
|
_ if last_line_extendable(&cond_str) => " ",
|
|
// 2 = ` {`
|
|
_ if cond_str.contains('\n') || cond_str.len() + 2 > cond_shape.width => alt_block_sep,
|
|
_ => " ",
|
|
};
|
|
|
|
let nested_indent_str = shape
|
|
.indent
|
|
.block_indent(context.config)
|
|
.to_string(context.config);
|
|
// Inner attributes.
|
|
let inner_attrs = &inner_attributes(attrs);
|
|
let inner_attrs_str = if inner_attrs.is_empty() {
|
|
String::new()
|
|
} else {
|
|
let shape = match context.config.version() {
|
|
Version::One => shape,
|
|
_ => shape.block_indent(context.config.tab_spaces())
|
|
};
|
|
inner_attrs
|
|
.rewrite(context, shape)
|
|
.map(|s| format!("{}{}\n", nested_indent_str, s))?
|
|
};
|
|
|
|
let open_brace_pos = if inner_attrs.is_empty() {
|
|
let hi = if arms.is_empty() {
|
|
span.hi()
|
|
} else {
|
|
arms[0].span().lo()
|
|
};
|
|
context
|
|
.snippet_provider
|
|
.span_after(mk_sp(cond.span.hi(), hi), "{")
|
|
} else {
|
|
inner_attrs[inner_attrs.len() - 1].span.hi()
|
|
};
|
|
|
|
if arms.is_empty() {
|
|
let snippet = context.snippet(mk_sp(open_brace_pos, span.hi() - BytePos(1)));
|
|
if snippet.trim().is_empty() {
|
|
Some(format!("match {cond_str} {{}}"))
|
|
} else {
|
|
// Empty match with comments or inner attributes? We are not going to bother, sorry ;)
|
|
Some(context.snippet(span).to_owned())
|
|
}
|
|
} else {
|
|
let span_after_cond = mk_sp(cond.span.hi(), span.hi());
|
|
Some(format!(
|
|
"match {}{}{{\n{}{}{}\n{}}}",
|
|
cond_str,
|
|
block_sep,
|
|
inner_attrs_str,
|
|
nested_indent_str,
|
|
rewrite_match_arms(context, arms, shape, span_after_cond, open_brace_pos)?,
|
|
shape.indent.to_string(context.config),
|
|
))
|
|
}
|
|
}
|
|
|
|
fn arm_comma(config: &Config, body: &ast::Expr, is_last: bool) -> &'static str {
|
|
if is_last && config.trailing_comma() == SeparatorTactic::Never {
|
|
""
|
|
} else if config.match_block_trailing_comma() {
|
|
","
|
|
} else if let ast::ExprKind::Block(ref block, _) = body.kind {
|
|
if let ast::BlockCheckMode::Default = block.rules {
|
|
""
|
|
} else {
|
|
","
|
|
}
|
|
} else {
|
|
","
|
|
}
|
|
}
|
|
|
|
/// Collect a byte position of the beginning `|` for each arm, if available.
|
|
fn collect_beginning_verts(
|
|
context: &RewriteContext<'_>,
|
|
arms: &[ast::Arm],
|
|
) -> Vec<Option<BytePos>> {
|
|
arms.iter()
|
|
.map(|a| {
|
|
context
|
|
.snippet(a.pat.span)
|
|
.starts_with('|')
|
|
.then(|| a.pat.span().lo())
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
fn rewrite_match_arms(
|
|
context: &RewriteContext<'_>,
|
|
arms: &[ast::Arm],
|
|
shape: Shape,
|
|
span: Span,
|
|
open_brace_pos: BytePos,
|
|
) -> Option<String> {
|
|
let arm_shape = shape
|
|
.block_indent(context.config.tab_spaces())
|
|
.with_max_width(context.config);
|
|
|
|
let arm_len = arms.len();
|
|
let is_last_iter = repeat(false)
|
|
.take(arm_len.saturating_sub(1))
|
|
.chain(repeat(true));
|
|
let beginning_verts = collect_beginning_verts(context, arms);
|
|
let items = itemize_list(
|
|
context.snippet_provider,
|
|
arms.iter()
|
|
.zip(is_last_iter)
|
|
.zip(beginning_verts.into_iter())
|
|
.map(|((arm, is_last), beginning_vert)| ArmWrapper::new(arm, is_last, beginning_vert)),
|
|
"}",
|
|
"|",
|
|
|arm| arm.span().lo(),
|
|
|arm| arm.span().hi(),
|
|
|arm| arm.rewrite(context, arm_shape),
|
|
open_brace_pos,
|
|
span.hi(),
|
|
false,
|
|
);
|
|
let arms_vec: Vec<_> = items.collect();
|
|
// We will add/remove commas inside `arm.rewrite()`, and hence no separator here.
|
|
let fmt = ListFormatting::new(arm_shape, context.config)
|
|
.separator("")
|
|
.preserve_newline(true);
|
|
|
|
write_list(&arms_vec, &fmt)
|
|
}
|
|
|
|
fn rewrite_match_arm(
|
|
context: &RewriteContext<'_>,
|
|
arm: &ast::Arm,
|
|
shape: Shape,
|
|
is_last: bool,
|
|
has_leading_pipe: bool,
|
|
) -> Option<String> {
|
|
let (missing_span, attrs_str) = if !arm.attrs.is_empty() {
|
|
if contains_skip(&arm.attrs) {
|
|
let (_, body) = flatten_arm_body(context, arm.body.as_deref()?, None);
|
|
// `arm.span()` does not include trailing comma, add it manually.
|
|
return Some(format!(
|
|
"{}{}",
|
|
context.snippet(arm.span()),
|
|
arm_comma(context.config, body, is_last),
|
|
));
|
|
}
|
|
let missing_span = mk_sp(arm.attrs[arm.attrs.len() - 1].span.hi(), arm.pat.span.lo());
|
|
(missing_span, arm.attrs.rewrite(context, shape)?)
|
|
} else {
|
|
(mk_sp(arm.span().lo(), arm.span().lo()), String::new())
|
|
};
|
|
|
|
// Leading pipe offset
|
|
// 2 = `| `
|
|
let (pipe_offset, pipe_str) = match context.config.match_arm_leading_pipes() {
|
|
MatchArmLeadingPipe::Never => (0, ""),
|
|
MatchArmLeadingPipe::Preserve if !has_leading_pipe => (0, ""),
|
|
MatchArmLeadingPipe::Preserve | MatchArmLeadingPipe::Always => (2, "| "),
|
|
};
|
|
|
|
// Patterns
|
|
let pat_shape = match &arm.body.as_ref()?.kind {
|
|
ast::ExprKind::Block(_, Some(label)) => {
|
|
// Some block with a label ` => 'label: {`
|
|
// 7 = ` => : {`
|
|
let label_len = label.ident.as_str().len();
|
|
shape.sub_width(7 + label_len)?.offset_left(pipe_offset)?
|
|
}
|
|
_ => {
|
|
// 5 = ` => {`
|
|
shape.sub_width(5)?.offset_left(pipe_offset)?
|
|
}
|
|
};
|
|
let pats_str = arm.pat.rewrite(context, pat_shape)?;
|
|
|
|
// Guard
|
|
let block_like_pat = trimmed_last_line_width(&pats_str) <= context.config.tab_spaces();
|
|
let new_line_guard = pats_str.contains('\n') && !block_like_pat;
|
|
let guard_str = rewrite_guard(
|
|
context,
|
|
&arm.guard,
|
|
shape,
|
|
trimmed_last_line_width(&pats_str),
|
|
new_line_guard,
|
|
)?;
|
|
|
|
let lhs_str = combine_strs_with_missing_comments(
|
|
context,
|
|
&attrs_str,
|
|
&format!("{pipe_str}{pats_str}{guard_str}"),
|
|
missing_span,
|
|
shape,
|
|
false,
|
|
)?;
|
|
|
|
let arrow_span = mk_sp(arm.pat.span.hi(), arm.body.as_ref()?.span().lo());
|
|
rewrite_match_body(
|
|
context,
|
|
arm.body.as_ref()?,
|
|
&lhs_str,
|
|
shape,
|
|
guard_str.contains('\n'),
|
|
arrow_span,
|
|
is_last,
|
|
)
|
|
}
|
|
|
|
fn stmt_is_expr_mac(stmt: &ast::Stmt) -> bool {
|
|
if let ast::StmtKind::Expr(expr) = &stmt.kind {
|
|
if let ast::ExprKind::MacCall(_) = &expr.kind {
|
|
return true;
|
|
}
|
|
}
|
|
false
|
|
}
|
|
|
|
fn block_can_be_flattened<'a>(
|
|
context: &RewriteContext<'_>,
|
|
expr: &'a ast::Expr,
|
|
) -> Option<&'a ast::Block> {
|
|
match expr.kind {
|
|
ast::ExprKind::Block(ref block, label)
|
|
if label.is_none()
|
|
&& !is_unsafe_block(block)
|
|
&& !context.inside_macro()
|
|
&& is_simple_block(context, block, Some(&expr.attrs))
|
|
&& !stmt_is_expr_mac(&block.stmts[0]) =>
|
|
{
|
|
Some(&*block)
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
// (extend, body)
|
|
// @extend: true if the arm body can be put next to `=>`
|
|
// @body: flattened body, if the body is block with a single expression
|
|
fn flatten_arm_body<'a>(
|
|
context: &'a RewriteContext<'_>,
|
|
body: &'a ast::Expr,
|
|
opt_shape: Option<Shape>,
|
|
) -> (bool, &'a ast::Expr) {
|
|
let can_extend =
|
|
|expr| !context.config.force_multiline_blocks() && can_flatten_block_around_this(expr);
|
|
|
|
if let Some(block) = block_can_be_flattened(context, body) {
|
|
if let ast::StmtKind::Expr(ref expr) = block.stmts[0].kind {
|
|
if let ast::ExprKind::Block(..) = expr.kind {
|
|
if expr.attrs.is_empty() {
|
|
flatten_arm_body(context, expr, None)
|
|
} else {
|
|
(true, body)
|
|
}
|
|
} else {
|
|
let cond_becomes_multi_line = opt_shape
|
|
.and_then(|shape| rewrite_cond(context, expr, shape))
|
|
.map_or(false, |cond| cond.contains('\n'));
|
|
if cond_becomes_multi_line {
|
|
(false, &*body)
|
|
} else {
|
|
(can_extend(expr), &*expr)
|
|
}
|
|
}
|
|
} else {
|
|
(false, &*body)
|
|
}
|
|
} else {
|
|
(can_extend(body), &*body)
|
|
}
|
|
}
|
|
|
|
fn rewrite_match_body(
|
|
context: &RewriteContext<'_>,
|
|
body: &ptr::P<ast::Expr>,
|
|
pats_str: &str,
|
|
shape: Shape,
|
|
has_guard: bool,
|
|
arrow_span: Span,
|
|
is_last: bool,
|
|
) -> Option<String> {
|
|
let (extend, body) = flatten_arm_body(
|
|
context,
|
|
body,
|
|
shape.offset_left(extra_offset(pats_str, shape) + 4),
|
|
);
|
|
let (is_block, is_empty_block) = if let ast::ExprKind::Block(ref block, _) = body.kind {
|
|
(true, is_empty_block(context, block, Some(&body.attrs)))
|
|
} else {
|
|
(false, false)
|
|
};
|
|
|
|
let comma = arm_comma(context.config, body, is_last);
|
|
let alt_block_sep = &shape.indent.to_string_with_newline(context.config);
|
|
|
|
let combine_orig_body = |body_str: &str| {
|
|
let block_sep = match context.config.control_brace_style() {
|
|
ControlBraceStyle::AlwaysNextLine if is_block => alt_block_sep,
|
|
_ => " ",
|
|
};
|
|
|
|
Some(format!("{} =>{}{}{}", pats_str, block_sep, body_str, comma))
|
|
};
|
|
|
|
let next_line_indent = if !is_block || is_empty_block {
|
|
shape.indent.block_indent(context.config)
|
|
} else {
|
|
shape.indent
|
|
};
|
|
|
|
let forbid_same_line =
|
|
(has_guard && pats_str.contains('\n') && !is_empty_block) || !body.attrs.is_empty();
|
|
|
|
// Look for comments between `=>` and the start of the body.
|
|
let arrow_comment = {
|
|
let arrow_snippet = context.snippet(arrow_span).trim();
|
|
// search for the arrow starting from the end of the snippet since there may be a match
|
|
// expression within the guard
|
|
let arrow_index = if context.config.version() == Version::One {
|
|
arrow_snippet.rfind("=>").unwrap()
|
|
} else {
|
|
arrow_snippet.find_last_uncommented("=>").unwrap()
|
|
};
|
|
// 2 = `=>`
|
|
let comment_str = arrow_snippet[arrow_index + 2..].trim();
|
|
if comment_str.is_empty() {
|
|
String::new()
|
|
} else {
|
|
rewrite_comment(comment_str, false, shape, context.config)?
|
|
}
|
|
};
|
|
|
|
let combine_next_line_body = |body_str: &str| {
|
|
let nested_indent_str = next_line_indent.to_string_with_newline(context.config);
|
|
|
|
if is_block {
|
|
let mut result = pats_str.to_owned();
|
|
result.push_str(" =>");
|
|
if !arrow_comment.is_empty() {
|
|
result.push_str(&nested_indent_str);
|
|
result.push_str(&arrow_comment);
|
|
}
|
|
result.push_str(&nested_indent_str);
|
|
result.push_str(body_str);
|
|
result.push_str(comma);
|
|
return Some(result);
|
|
}
|
|
|
|
let indent_str = shape.indent.to_string_with_newline(context.config);
|
|
let (body_prefix, body_suffix) =
|
|
if context.config.match_arm_blocks() && !context.inside_macro() {
|
|
let comma = if context.config.match_block_trailing_comma() {
|
|
","
|
|
} else {
|
|
""
|
|
};
|
|
let semicolon = if context.config.version() == Version::One {
|
|
""
|
|
} else {
|
|
if semicolon_for_expr(context, body) {
|
|
";"
|
|
} else {
|
|
""
|
|
}
|
|
};
|
|
("{", format!("{}{}}}{}", semicolon, indent_str, comma))
|
|
} else {
|
|
("", String::from(","))
|
|
};
|
|
|
|
let block_sep = match context.config.control_brace_style() {
|
|
_ if body_prefix.is_empty() => "".to_owned(),
|
|
ControlBraceStyle::AlwaysNextLine => format!("{}{}", alt_block_sep, body_prefix),
|
|
_ if forbid_same_line || !arrow_comment.is_empty() => {
|
|
format!("{}{}", alt_block_sep, body_prefix)
|
|
}
|
|
_ => format!(" {}", body_prefix),
|
|
} + &nested_indent_str;
|
|
|
|
let mut result = pats_str.to_owned();
|
|
result.push_str(" =>");
|
|
if !arrow_comment.is_empty() {
|
|
result.push_str(&indent_str);
|
|
result.push_str(&arrow_comment);
|
|
}
|
|
result.push_str(&block_sep);
|
|
result.push_str(body_str);
|
|
result.push_str(&body_suffix);
|
|
Some(result)
|
|
};
|
|
|
|
// Let's try and get the arm body on the same line as the condition.
|
|
// 4 = ` => `.len()
|
|
let orig_body_shape = shape
|
|
.offset_left(extra_offset(pats_str, shape) + 4)
|
|
.and_then(|shape| shape.sub_width(comma.len()));
|
|
let orig_body = if forbid_same_line || !arrow_comment.is_empty() {
|
|
None
|
|
} else if let Some(body_shape) = orig_body_shape {
|
|
let rewrite = nop_block_collapse(
|
|
format_expr(body, ExprType::Statement, context, body_shape),
|
|
body_shape.width,
|
|
);
|
|
|
|
match rewrite {
|
|
Some(ref body_str)
|
|
if is_block
|
|
|| (!body_str.contains('\n')
|
|
&& unicode_str_width(body_str) <= body_shape.width) =>
|
|
{
|
|
return combine_orig_body(body_str);
|
|
}
|
|
_ => rewrite,
|
|
}
|
|
} else {
|
|
None
|
|
};
|
|
let orig_budget = orig_body_shape.map_or(0, |shape| shape.width);
|
|
|
|
// Try putting body on the next line and see if it looks better.
|
|
let next_line_body_shape = Shape::indented(next_line_indent, context.config);
|
|
let next_line_body = nop_block_collapse(
|
|
format_expr(body, ExprType::Statement, context, next_line_body_shape),
|
|
next_line_body_shape.width,
|
|
);
|
|
match (orig_body, next_line_body) {
|
|
(Some(ref orig_str), Some(ref next_line_str))
|
|
if prefer_next_line(orig_str, next_line_str, RhsTactics::Default) =>
|
|
{
|
|
combine_next_line_body(next_line_str)
|
|
}
|
|
(Some(ref orig_str), _) if extend && first_line_width(orig_str) <= orig_budget => {
|
|
combine_orig_body(orig_str)
|
|
}
|
|
(Some(ref orig_str), Some(ref next_line_str)) if orig_str.contains('\n') => {
|
|
combine_next_line_body(next_line_str)
|
|
}
|
|
(None, Some(ref next_line_str)) => combine_next_line_body(next_line_str),
|
|
(None, None) => None,
|
|
(Some(ref orig_str), _) => combine_orig_body(orig_str),
|
|
}
|
|
}
|
|
|
|
// The `if ...` guard on a match arm.
|
|
fn rewrite_guard(
|
|
context: &RewriteContext<'_>,
|
|
guard: &Option<ptr::P<ast::Expr>>,
|
|
shape: Shape,
|
|
// The amount of space used up on this line for the pattern in
|
|
// the arm (excludes offset).
|
|
pattern_width: usize,
|
|
multiline_pattern: bool,
|
|
) -> Option<String> {
|
|
if let Some(ref guard) = *guard {
|
|
// First try to fit the guard string on the same line as the pattern.
|
|
// 4 = ` if `, 5 = ` => {`
|
|
let cond_shape = shape
|
|
.offset_left(pattern_width + 4)
|
|
.and_then(|s| s.sub_width(5));
|
|
if !multiline_pattern {
|
|
if let Some(cond_shape) = cond_shape {
|
|
if let Some(cond_str) = guard.rewrite(context, cond_shape) {
|
|
if !cond_str.contains('\n') || pattern_width <= context.config.tab_spaces() {
|
|
return Some(format!(" if {cond_str}"));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Not enough space to put the guard after the pattern, try a newline.
|
|
// 3 = `if `, 5 = ` => {`
|
|
let cond_shape = Shape::indented(shape.indent.block_indent(context.config), context.config)
|
|
.offset_left(3)
|
|
.and_then(|s| s.sub_width(5));
|
|
if let Some(cond_shape) = cond_shape {
|
|
if let Some(cond_str) = guard.rewrite(context, cond_shape) {
|
|
return Some(format!(
|
|
"{}if {}",
|
|
cond_shape.indent.to_string_with_newline(context.config),
|
|
cond_str
|
|
));
|
|
}
|
|
}
|
|
|
|
None
|
|
} else {
|
|
Some(String::new())
|
|
}
|
|
}
|
|
|
|
fn nop_block_collapse(block_str: Option<String>, budget: usize) -> Option<String> {
|
|
debug!("nop_block_collapse {:?} {}", block_str, budget);
|
|
block_str.map(|block_str| {
|
|
if block_str.starts_with('{')
|
|
&& budget >= 2
|
|
&& (block_str[1..].find(|c: char| !c.is_whitespace()).unwrap() == block_str.len() - 2)
|
|
{
|
|
String::from("{}")
|
|
} else {
|
|
block_str
|
|
}
|
|
})
|
|
}
|
|
|
|
fn can_flatten_block_around_this(body: &ast::Expr) -> bool {
|
|
match body.kind {
|
|
// We do not allow `if` to stay on the same line, since we could easily mistake
|
|
// `pat => if cond { ... }` and `pat if cond => { ... }`.
|
|
ast::ExprKind::If(..) => false,
|
|
// We do not allow collapsing a block around expression with condition
|
|
// to avoid it being cluttered with match arm.
|
|
ast::ExprKind::ForLoop { .. } | ast::ExprKind::While(..) => false,
|
|
ast::ExprKind::Loop(..)
|
|
| ast::ExprKind::Match(..)
|
|
| ast::ExprKind::Block(..)
|
|
| ast::ExprKind::Closure(..)
|
|
| ast::ExprKind::Array(..)
|
|
| ast::ExprKind::Call(..)
|
|
| ast::ExprKind::MethodCall(..)
|
|
| ast::ExprKind::MacCall(..)
|
|
| ast::ExprKind::Struct(..)
|
|
| ast::ExprKind::Tup(..) => true,
|
|
ast::ExprKind::AddrOf(_, _, ref expr)
|
|
| ast::ExprKind::Try(ref expr)
|
|
| ast::ExprKind::Unary(_, ref expr)
|
|
| ast::ExprKind::Index(ref expr, _, _)
|
|
| ast::ExprKind::Cast(ref expr, _) => can_flatten_block_around_this(expr),
|
|
_ => false,
|
|
}
|
|
}
|