2021-11-04 12:52:36 +00:00
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//! This module contains functions that retrieve specific elements.
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2016-06-29 19:23:21 +00:00
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2018-08-01 20:48:41 +00:00
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#![deny(clippy::missing_docs_in_private_items)]
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2016-08-23 17:39:36 +00:00
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2022-05-21 11:24:00 +00:00
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use crate::consts::{constant_simple, Constant};
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2021-10-21 11:11:36 +00:00
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use crate::ty::is_type_diagnostic_item;
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2022-01-13 12:18:19 +00:00
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use crate::{is_expn_of, match_def_path, paths};
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2018-11-27 20:14:15 +00:00
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use if_chain::if_chain;
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2022-05-21 11:24:00 +00:00
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use rustc_ast::ast;
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2020-01-06 16:39:50 +00:00
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use rustc_hir as hir;
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2022-01-13 12:18:19 +00:00
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use rustc_hir::{Arm, Block, Expr, ExprKind, HirId, LoopSource, MatchSource, Node, Pat, QPath};
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2020-01-12 06:08:41 +00:00
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use rustc_lint::LateContext;
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2022-01-13 12:18:19 +00:00
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use rustc_span::{sym, symbol, Span};
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2016-06-29 19:23:21 +00:00
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2021-08-08 14:49:13 +00:00
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/// The essential nodes of a desugared for loop as well as the entire span:
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/// `for pat in arg { body }` becomes `(pat, arg, body)`. Return `(pat, arg, body, span)`.
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pub struct ForLoop<'tcx> {
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2021-09-08 14:31:47 +00:00
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/// `for` loop item
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2021-08-08 14:49:13 +00:00
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pub pat: &'tcx hir::Pat<'tcx>,
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2021-09-08 14:31:47 +00:00
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/// `IntoIterator` argument
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2021-08-08 14:49:13 +00:00
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pub arg: &'tcx hir::Expr<'tcx>,
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2021-09-08 14:31:47 +00:00
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/// `for` loop body
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2021-08-08 14:49:13 +00:00
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pub body: &'tcx hir::Expr<'tcx>,
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2021-10-27 14:48:06 +00:00
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/// Compare this against `hir::Destination.target`
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pub loop_id: HirId,
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2021-09-08 14:31:47 +00:00
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/// entire `for` loop span
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2021-08-08 14:49:13 +00:00
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pub span: Span,
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2016-06-29 21:16:44 +00:00
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}
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2021-08-08 14:49:13 +00:00
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impl<'tcx> ForLoop<'tcx> {
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2021-09-08 14:31:47 +00:00
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/// Parses a desugared `for` loop
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2021-08-08 14:49:13 +00:00
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pub fn hir(expr: &Expr<'tcx>) -> Option<Self> {
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if_chain! {
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2021-10-27 14:48:06 +00:00
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if let hir::ExprKind::DropTemps(e) = expr.kind;
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if let hir::ExprKind::Match(iterexpr, [arm], hir::MatchSource::ForLoopDesugar) = e.kind;
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if let hir::ExprKind::Call(_, [arg]) = iterexpr.kind;
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if let hir::ExprKind::Loop(block, ..) = arm.body.kind;
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2022-06-04 11:34:07 +00:00
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if let [stmt] = block.stmts;
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2021-10-27 14:48:06 +00:00
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if let hir::StmtKind::Expr(e) = stmt.kind;
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if let hir::ExprKind::Match(_, [_, some_arm], _) = e.kind;
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if let hir::PatKind::Struct(_, [field], _) = some_arm.pat.kind;
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2021-08-08 14:49:13 +00:00
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then {
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return Some(Self {
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2021-10-27 14:48:06 +00:00
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pat: field.pat,
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arg,
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body: some_arm.body,
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loop_id: arm.body.hir_id,
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span: expr.span.ctxt().outer_expn_data().call_site,
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2021-08-08 14:49:13 +00:00
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});
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}
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}
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None
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2018-10-08 00:07:10 +00:00
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}
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2021-08-08 14:49:13 +00:00
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}
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2021-09-08 14:31:47 +00:00
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/// An `if` expression without `DropTemps`
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2021-08-08 14:49:13 +00:00
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pub struct If<'hir> {
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2021-09-08 14:31:47 +00:00
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/// `if` condition
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2021-08-08 14:49:13 +00:00
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pub cond: &'hir Expr<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `if` then expression
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2021-08-08 14:49:13 +00:00
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pub then: &'hir Expr<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `else` expression
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pub r#else: Option<&'hir Expr<'hir>>,
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2021-08-08 14:49:13 +00:00
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}
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2018-10-08 00:07:10 +00:00
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2021-08-08 14:49:13 +00:00
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impl<'hir> If<'hir> {
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#[inline]
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2021-09-08 14:31:47 +00:00
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/// Parses an `if` expression
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2021-08-08 14:49:13 +00:00
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pub const fn hir(expr: &Expr<'hir>) -> Option<Self> {
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if let ExprKind::If(
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Expr {
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kind: ExprKind::DropTemps(cond),
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..
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},
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then,
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r#else,
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) = expr.kind
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2020-08-28 14:10:16 +00:00
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{
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2021-09-08 14:31:47 +00:00
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Some(Self { cond, then, r#else })
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2021-08-08 14:49:13 +00:00
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} else {
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None
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}
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2016-06-29 21:16:44 +00:00
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}
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}
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2021-09-08 14:31:47 +00:00
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/// An `if let` expression
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2021-08-08 14:49:13 +00:00
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pub struct IfLet<'hir> {
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2021-09-08 14:31:47 +00:00
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/// `if let` pattern
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2021-08-08 14:49:13 +00:00
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pub let_pat: &'hir Pat<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `if let` scrutinee
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2021-08-08 14:49:13 +00:00
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pub let_expr: &'hir Expr<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `if let` then expression
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2021-08-08 14:49:13 +00:00
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pub if_then: &'hir Expr<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `if let` else expression
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2021-08-08 14:49:13 +00:00
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pub if_else: Option<&'hir Expr<'hir>>,
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}
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impl<'hir> IfLet<'hir> {
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2021-09-08 14:31:47 +00:00
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/// Parses an `if let` expression
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2021-08-19 18:31:25 +00:00
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pub fn hir(cx: &LateContext<'_>, expr: &Expr<'hir>) -> Option<Self> {
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2021-08-08 14:49:13 +00:00
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if let ExprKind::If(
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Expr {
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2021-10-13 07:44:47 +00:00
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kind:
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ExprKind::Let(hir::Let {
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pat: let_pat,
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init: let_expr,
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..
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}),
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2021-08-08 14:49:13 +00:00
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..
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},
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if_then,
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if_else,
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) = expr.kind
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{
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2021-09-18 20:48:07 +00:00
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let mut iter = cx.tcx.hir().parent_iter(expr.hir_id);
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2021-08-19 18:31:25 +00:00
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if let Some((_, Node::Block(Block { stmts: [], .. }))) = iter.next() {
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2021-09-08 14:31:47 +00:00
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if let Some((
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_,
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Node::Expr(Expr {
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kind: ExprKind::Loop(_, _, LoopSource::While, _),
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..
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}),
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)) = iter.next()
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{
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2021-08-19 18:31:25 +00:00
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// while loop desugar
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return None;
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}
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}
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2021-08-08 14:49:13 +00:00
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return Some(Self {
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let_pat,
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let_expr,
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if_then,
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if_else,
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});
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2017-10-23 19:18:02 +00:00
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}
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2021-08-08 14:49:13 +00:00
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None
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2017-10-23 19:18:02 +00:00
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}
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2021-08-08 14:49:13 +00:00
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}
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2017-08-18 14:07:39 +00:00
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2021-09-08 14:31:47 +00:00
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/// An `if let` or `match` expression. Useful for lints that trigger on one or the other.
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pub enum IfLetOrMatch<'hir> {
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/// Any `match` expression
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Match(&'hir Expr<'hir>, &'hir [Arm<'hir>], MatchSource),
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/// scrutinee, pattern, then block, else block
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IfLet(
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&'hir Expr<'hir>,
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&'hir Pat<'hir>,
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&'hir Expr<'hir>,
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Option<&'hir Expr<'hir>>,
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),
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}
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impl<'hir> IfLetOrMatch<'hir> {
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/// Parses an `if let` or `match` expression
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pub fn parse(cx: &LateContext<'_>, expr: &Expr<'hir>) -> Option<Self> {
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match expr.kind {
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ExprKind::Match(expr, arms, source) => Some(Self::Match(expr, arms, source)),
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_ => IfLet::hir(cx, expr).map(
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|IfLet {
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let_expr,
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let_pat,
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if_then,
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if_else,
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}| { Self::IfLet(let_expr, let_pat, if_then, if_else) },
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),
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}
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}
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}
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/// An `if` or `if let` expression
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2021-08-08 14:49:13 +00:00
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pub struct IfOrIfLet<'hir> {
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2021-09-08 14:31:47 +00:00
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/// `if` condition that is maybe a `let` expression
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2021-08-08 14:49:13 +00:00
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pub cond: &'hir Expr<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `if` then expression
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2021-08-08 14:49:13 +00:00
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pub then: &'hir Expr<'hir>,
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2021-09-08 14:31:47 +00:00
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/// `else` expression
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pub r#else: Option<&'hir Expr<'hir>>,
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2016-06-29 22:08:43 +00:00
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}
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2021-08-08 14:49:13 +00:00
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impl<'hir> IfOrIfLet<'hir> {
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#[inline]
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2021-09-08 14:31:47 +00:00
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/// Parses an `if` or `if let` expression
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2021-08-08 14:49:13 +00:00
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pub const fn hir(expr: &Expr<'hir>) -> Option<Self> {
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if let ExprKind::If(cond, then, r#else) = expr.kind {
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if let ExprKind::DropTemps(new_cond) = cond.kind {
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return Some(Self {
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cond: new_cond,
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r#else,
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then,
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});
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}
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if let ExprKind::Let(..) = cond.kind {
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2021-09-08 14:31:47 +00:00
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return Some(Self { cond, then, r#else });
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2021-08-08 14:49:13 +00:00
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}
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2017-10-23 19:18:02 +00:00
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}
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2021-08-08 14:49:13 +00:00
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None
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2017-10-23 19:18:02 +00:00
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}
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2016-06-29 22:08:43 +00:00
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}
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2016-06-30 17:49:34 +00:00
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2021-08-08 14:49:13 +00:00
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/// Represent a range akin to `ast::ExprKind::Range`.
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#[derive(Debug, Copy, Clone)]
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pub struct Range<'a> {
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/// The lower bound of the range, or `None` for ranges such as `..X`.
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pub start: Option<&'a hir::Expr<'a>>,
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/// The upper bound of the range, or `None` for ranges such as `X..`.
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pub end: Option<&'a hir::Expr<'a>>,
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/// Whether the interval is open or closed.
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pub limits: ast::RangeLimits,
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}
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impl<'a> Range<'a> {
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/// Higher a `hir` range to something similar to `ast::ExprKind::Range`.
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pub fn hir(expr: &'a hir::Expr<'_>) -> Option<Range<'a>> {
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/// Finds the field named `name` in the field. Always return `Some` for
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/// convenience.
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fn get_field<'c>(name: &str, fields: &'c [hir::ExprField<'_>]) -> Option<&'c hir::Expr<'c>> {
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let expr = &fields.iter().find(|field| field.ident.name.as_str() == name)?.expr;
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Some(expr)
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}
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match expr.kind {
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2021-09-08 14:31:47 +00:00
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hir::ExprKind::Call(path, args)
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2021-08-08 14:49:13 +00:00
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if matches!(
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path.kind,
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2021-11-16 20:44:25 +00:00
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hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::RangeInclusiveNew, ..))
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2021-08-08 14:49:13 +00:00
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) =>
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{
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Some(Range {
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start: Some(&args[0]),
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end: Some(&args[1]),
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limits: ast::RangeLimits::Closed,
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})
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},
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2021-09-08 14:31:47 +00:00
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hir::ExprKind::Struct(path, fields, None) => match &path {
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2021-11-16 20:44:25 +00:00
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hir::QPath::LangItem(hir::LangItem::RangeFull, ..) => Some(Range {
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2021-08-08 14:49:13 +00:00
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start: None,
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end: None,
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limits: ast::RangeLimits::HalfOpen,
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}),
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2021-11-16 20:44:25 +00:00
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hir::QPath::LangItem(hir::LangItem::RangeFrom, ..) => Some(Range {
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2021-08-08 14:49:13 +00:00
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start: Some(get_field("start", fields)?),
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end: None,
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limits: ast::RangeLimits::HalfOpen,
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}),
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2021-11-16 20:44:25 +00:00
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hir::QPath::LangItem(hir::LangItem::Range, ..) => Some(Range {
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2021-08-08 14:49:13 +00:00
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start: Some(get_field("start", fields)?),
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end: Some(get_field("end", fields)?),
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limits: ast::RangeLimits::HalfOpen,
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}),
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2021-11-16 20:44:25 +00:00
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hir::QPath::LangItem(hir::LangItem::RangeToInclusive, ..) => Some(Range {
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2021-08-08 14:49:13 +00:00
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start: None,
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end: Some(get_field("end", fields)?),
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limits: ast::RangeLimits::Closed,
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}),
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2021-11-16 20:44:25 +00:00
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hir::QPath::LangItem(hir::LangItem::RangeTo, ..) => Some(Range {
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2021-08-08 14:49:13 +00:00
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start: None,
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end: Some(get_field("end", fields)?),
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limits: ast::RangeLimits::HalfOpen,
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}),
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_ => None,
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},
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_ => None,
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2019-07-06 17:35:08 +00:00
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}
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}
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}
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2016-06-30 17:49:34 +00:00
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/// Represent the pre-expansion arguments of a `vec!` invocation.
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pub enum VecArgs<'a> {
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/// `vec![elem; len]`
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2019-12-27 07:12:26 +00:00
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Repeat(&'a hir::Expr<'a>, &'a hir::Expr<'a>),
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2016-06-30 17:49:34 +00:00
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/// `vec![a, b, c]`
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2019-12-27 07:12:26 +00:00
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Vec(&'a [hir::Expr<'a>]),
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2016-06-30 17:49:34 +00:00
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}
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2021-08-08 14:49:13 +00:00
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impl<'a> VecArgs<'a> {
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/// Returns the arguments of the `vec!` macro if this expression was expanded
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|
/// from `vec!`.
|
|
|
|
pub fn hir(cx: &LateContext<'_>, expr: &'a hir::Expr<'_>) -> Option<VecArgs<'a>> {
|
|
|
|
if_chain! {
|
2021-09-08 14:31:47 +00:00
|
|
|
if let hir::ExprKind::Call(fun, args) = expr.kind;
|
2021-08-08 14:49:13 +00:00
|
|
|
if let hir::ExprKind::Path(ref qpath) = fun.kind;
|
|
|
|
if is_expn_of(fun.span, "vec").is_some();
|
|
|
|
if let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
|
|
|
|
then {
|
|
|
|
return if match_def_path(cx, fun_def_id, &paths::VEC_FROM_ELEM) && args.len() == 2 {
|
|
|
|
// `vec![elem; size]` case
|
|
|
|
Some(VecArgs::Repeat(&args[0], &args[1]))
|
2022-02-10 17:40:06 +00:00
|
|
|
} else if match_def_path(cx, fun_def_id, &paths::SLICE_INTO_VEC) && args.len() == 1 {
|
2021-08-08 14:49:13 +00:00
|
|
|
// `vec![a, b, c]` case
|
2023-02-27 01:32:07 +00:00
|
|
|
if let hir::ExprKind::Call(_, [arg]) = &args[0].kind
|
|
|
|
&& let hir::ExprKind::Array(args) = arg.kind {
|
|
|
|
Some(VecArgs::Vec(args))
|
|
|
|
} else {
|
|
|
|
None
|
2021-08-08 14:49:13 +00:00
|
|
|
}
|
2022-02-10 17:40:06 +00:00
|
|
|
} else if match_def_path(cx, fun_def_id, &paths::VEC_NEW) && args.is_empty() {
|
2021-08-08 14:49:13 +00:00
|
|
|
Some(VecArgs::Vec(&[]))
|
2022-02-10 17:40:06 +00:00
|
|
|
} else {
|
2021-08-08 14:49:13 +00:00
|
|
|
None
|
|
|
|
};
|
2017-10-23 19:18:02 +00:00
|
|
|
}
|
2021-08-08 14:49:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-09-08 14:31:47 +00:00
|
|
|
/// A desugared `while` loop
|
2021-08-08 14:49:13 +00:00
|
|
|
pub struct While<'hir> {
|
2021-09-08 14:31:47 +00:00
|
|
|
/// `while` loop condition
|
|
|
|
pub condition: &'hir Expr<'hir>,
|
|
|
|
/// `while` loop body
|
|
|
|
pub body: &'hir Expr<'hir>,
|
2023-05-05 15:45:49 +00:00
|
|
|
/// Span of the loop header
|
|
|
|
pub span: Span,
|
2021-08-08 14:49:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
impl<'hir> While<'hir> {
|
|
|
|
#[inline]
|
2021-09-08 14:31:47 +00:00
|
|
|
/// Parses a desugared `while` loop
|
2021-08-08 14:49:13 +00:00
|
|
|
pub const fn hir(expr: &Expr<'hir>) -> Option<Self> {
|
|
|
|
if let ExprKind::Loop(
|
|
|
|
Block {
|
|
|
|
expr:
|
|
|
|
Some(Expr {
|
|
|
|
kind:
|
|
|
|
ExprKind::If(
|
|
|
|
Expr {
|
2021-09-08 14:31:47 +00:00
|
|
|
kind: ExprKind::DropTemps(condition),
|
2021-08-08 14:49:13 +00:00
|
|
|
..
|
|
|
|
},
|
2021-09-08 14:31:47 +00:00
|
|
|
body,
|
|
|
|
_,
|
2021-08-08 14:49:13 +00:00
|
|
|
),
|
|
|
|
..
|
|
|
|
}),
|
|
|
|
..
|
|
|
|
},
|
|
|
|
_,
|
|
|
|
LoopSource::While,
|
2023-05-05 15:45:49 +00:00
|
|
|
span,
|
2021-08-08 14:49:13 +00:00
|
|
|
) = expr.kind
|
|
|
|
{
|
2023-05-05 15:45:49 +00:00
|
|
|
return Some(Self { condition, body, span });
|
2021-08-08 14:49:13 +00:00
|
|
|
}
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-09-08 14:31:47 +00:00
|
|
|
/// A desugared `while let` loop
|
2021-08-08 14:49:13 +00:00
|
|
|
pub struct WhileLet<'hir> {
|
2021-09-08 14:31:47 +00:00
|
|
|
/// `while let` loop item pattern
|
2021-08-08 14:49:13 +00:00
|
|
|
pub let_pat: &'hir Pat<'hir>,
|
2021-09-08 14:31:47 +00:00
|
|
|
/// `while let` loop scrutinee
|
2021-08-08 14:49:13 +00:00
|
|
|
pub let_expr: &'hir Expr<'hir>,
|
2021-09-08 14:31:47 +00:00
|
|
|
/// `while let` loop body
|
2021-08-08 14:49:13 +00:00
|
|
|
pub if_then: &'hir Expr<'hir>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<'hir> WhileLet<'hir> {
|
|
|
|
#[inline]
|
2021-09-08 14:31:47 +00:00
|
|
|
/// Parses a desugared `while let` loop
|
2021-08-08 14:49:13 +00:00
|
|
|
pub const fn hir(expr: &Expr<'hir>) -> Option<Self> {
|
|
|
|
if let ExprKind::Loop(
|
|
|
|
Block {
|
2021-09-08 14:31:47 +00:00
|
|
|
expr:
|
|
|
|
Some(Expr {
|
|
|
|
kind:
|
|
|
|
ExprKind::If(
|
|
|
|
Expr {
|
2021-10-13 07:44:47 +00:00
|
|
|
kind:
|
|
|
|
ExprKind::Let(hir::Let {
|
|
|
|
pat: let_pat,
|
|
|
|
init: let_expr,
|
|
|
|
..
|
|
|
|
}),
|
2021-09-08 14:31:47 +00:00
|
|
|
..
|
|
|
|
},
|
|
|
|
if_then,
|
|
|
|
_,
|
|
|
|
),
|
|
|
|
..
|
|
|
|
}),
|
|
|
|
..
|
2021-08-08 14:49:13 +00:00
|
|
|
},
|
|
|
|
_,
|
|
|
|
LoopSource::While,
|
|
|
|
_,
|
|
|
|
) = expr.kind
|
|
|
|
{
|
2021-09-08 14:31:47 +00:00
|
|
|
return Some(Self {
|
|
|
|
let_pat,
|
|
|
|
let_expr,
|
|
|
|
if_then,
|
|
|
|
});
|
2016-06-30 17:49:34 +00:00
|
|
|
}
|
2021-08-08 14:49:13 +00:00
|
|
|
None
|
2017-10-23 19:18:02 +00:00
|
|
|
}
|
2021-08-08 14:49:13 +00:00
|
|
|
}
|
2016-06-30 17:49:34 +00:00
|
|
|
|
2021-08-08 14:49:13 +00:00
|
|
|
/// Converts a hir binary operator to the corresponding `ast` type.
|
|
|
|
#[must_use]
|
|
|
|
pub fn binop(op: hir::BinOpKind) -> ast::BinOpKind {
|
|
|
|
match op {
|
|
|
|
hir::BinOpKind::Eq => ast::BinOpKind::Eq,
|
|
|
|
hir::BinOpKind::Ge => ast::BinOpKind::Ge,
|
|
|
|
hir::BinOpKind::Gt => ast::BinOpKind::Gt,
|
|
|
|
hir::BinOpKind::Le => ast::BinOpKind::Le,
|
|
|
|
hir::BinOpKind::Lt => ast::BinOpKind::Lt,
|
|
|
|
hir::BinOpKind::Ne => ast::BinOpKind::Ne,
|
|
|
|
hir::BinOpKind::Or => ast::BinOpKind::Or,
|
|
|
|
hir::BinOpKind::Add => ast::BinOpKind::Add,
|
|
|
|
hir::BinOpKind::And => ast::BinOpKind::And,
|
|
|
|
hir::BinOpKind::BitAnd => ast::BinOpKind::BitAnd,
|
|
|
|
hir::BinOpKind::BitOr => ast::BinOpKind::BitOr,
|
|
|
|
hir::BinOpKind::BitXor => ast::BinOpKind::BitXor,
|
|
|
|
hir::BinOpKind::Div => ast::BinOpKind::Div,
|
|
|
|
hir::BinOpKind::Mul => ast::BinOpKind::Mul,
|
|
|
|
hir::BinOpKind::Rem => ast::BinOpKind::Rem,
|
|
|
|
hir::BinOpKind::Shl => ast::BinOpKind::Shl,
|
|
|
|
hir::BinOpKind::Shr => ast::BinOpKind::Shr,
|
|
|
|
hir::BinOpKind::Sub => ast::BinOpKind::Sub,
|
|
|
|
}
|
2016-06-30 17:49:34 +00:00
|
|
|
}
|
2020-10-23 20:16:59 +00:00
|
|
|
|
2021-10-21 11:11:36 +00:00
|
|
|
/// A parsed `Vec` initialization expression
|
|
|
|
#[derive(Clone, Copy)]
|
|
|
|
pub enum VecInitKind {
|
|
|
|
/// `Vec::new()`
|
|
|
|
New,
|
|
|
|
/// `Vec::default()` or `Default::default()`
|
|
|
|
Default,
|
|
|
|
/// `Vec::with_capacity(123)`
|
2022-05-21 11:24:00 +00:00
|
|
|
WithConstCapacity(u128),
|
2021-10-21 11:11:36 +00:00
|
|
|
/// `Vec::with_capacity(slice.len())`
|
|
|
|
WithExprCapacity(HirId),
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Checks if given expression is an initialization of `Vec` and returns its kind.
|
|
|
|
pub fn get_vec_init_kind<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<VecInitKind> {
|
|
|
|
if let ExprKind::Call(func, args) = expr.kind {
|
|
|
|
match func.kind {
|
|
|
|
ExprKind::Path(QPath::TypeRelative(ty, name))
|
|
|
|
if is_type_diagnostic_item(cx, cx.typeck_results().node_type(ty.hir_id), sym::Vec) =>
|
|
|
|
{
|
|
|
|
if name.ident.name == sym::new {
|
|
|
|
return Some(VecInitKind::New);
|
|
|
|
} else if name.ident.name == symbol::kw::Default {
|
|
|
|
return Some(VecInitKind::Default);
|
|
|
|
} else if name.ident.name.as_str() == "with_capacity" {
|
|
|
|
let arg = args.get(0)?;
|
2022-05-21 11:24:00 +00:00
|
|
|
return match constant_simple(cx, cx.typeck_results(), arg) {
|
|
|
|
Some(Constant::Int(num)) => Some(VecInitKind::WithConstCapacity(num)),
|
|
|
|
_ => Some(VecInitKind::WithExprCapacity(arg.hir_id)),
|
|
|
|
};
|
|
|
|
};
|
2021-11-04 12:52:36 +00:00
|
|
|
},
|
2021-10-21 11:11:36 +00:00
|
|
|
ExprKind::Path(QPath::Resolved(_, path))
|
|
|
|
if match_def_path(cx, path.res.opt_def_id()?, &paths::DEFAULT_TRAIT_METHOD)
|
|
|
|
&& is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(expr), sym::Vec) =>
|
|
|
|
{
|
|
|
|
return Some(VecInitKind::Default);
|
2021-11-04 12:52:36 +00:00
|
|
|
},
|
2021-10-21 11:11:36 +00:00
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
None
|
|
|
|
}
|