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Remove can_suggest from Clippy.

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Removes `can_suggest` from as it is no longer used.
Reverts rust-clippy#5724.
This commit is contained in:
Christiaan Dirkx 2020-09-21 00:00:33 +02:00
parent ed43385cab
commit 141b9c2890
1 changed files with 16 additions and 62 deletions
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78
clippy_lints/src/matches.rs
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@ -1440,15 +1440,12 @@ where
mod redundant_pattern_match {
use super::REDUNDANT_PATTERN_MATCHING;
use crate::utils::{in_constant, match_qpath, match_trait_method, paths, snippet, span_lint_and_then};
use crate::utils::{match_qpath, match_trait_method, paths, snippet, span_lint_and_then};
use if_chain::if_chain;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::{Arm, Expr, ExprKind, HirId, MatchSource, PatKind, QPath};
use rustc_hir::{Arm, Expr, ExprKind, MatchSource, PatKind, QPath};
use rustc_lint::LateContext;
use rustc_middle::ty;
use rustc_mir::const_eval::is_const_fn;
use rustc_span::source_map::Symbol;
pub fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
if let ExprKind::Match(op, arms, ref match_source) = &expr.kind {
@ -1468,37 +1465,24 @@ mod redundant_pattern_match {
arms: &[Arm<'_>],
keyword: &'static str,
) {
fn find_suggestion(cx: &LateContext<'_>, hir_id: HirId, path: &QPath<'_>) -> Option<&'static str> {
if match_qpath(path, &paths::RESULT_OK) {
return Some("is_ok()");
}
if match_qpath(path, &paths::RESULT_ERR) {
return Some("is_err()");
}
if match_qpath(path, &paths::OPTION_SOME) && can_suggest(cx, hir_id, sym!(option_type), "is_some") {
return Some("is_some()");
}
if match_qpath(path, &paths::OPTION_NONE) && can_suggest(cx, hir_id, sym!(option_type), "is_none") {
return Some("is_none()");
}
None
}
let hir_id = expr.hir_id;
let good_method = match arms[0].pat.kind {
PatKind::TupleStruct(ref path, ref patterns, _) if patterns.len() == 1 => {
if let PatKind::Wild = patterns[0].kind {
find_suggestion(cx, hir_id, path)
if match_qpath(path, &paths::RESULT_OK) {
"is_ok()"
} else if match_qpath(path, &paths::RESULT_ERR) {
"is_err()"
} else if match_qpath(path, &paths::OPTION_SOME) {
"is_some()"
} else {
return;
}
} else {
None
return;
}
},
PatKind::Path(ref path) => find_suggestion(cx, hir_id, path),
_ => None,
};
let good_method = match good_method {
Some(method) => method,
None => return,
PatKind::Path(ref path) if match_qpath(path, &paths::OPTION_NONE) => "is_none()",
_ => return,
};
// check that `while_let_on_iterator` lint does not trigger
@ -1547,7 +1531,6 @@ mod redundant_pattern_match {
if arms.len() == 2 {
let node_pair = (&arms[0].pat.kind, &arms[1].pat.kind);
let hir_id = expr.hir_id;
let found_good_method = match node_pair {
(
PatKind::TupleStruct(ref path_left, ref patterns_left, _),
@ -1562,8 +1545,6 @@ mod redundant_pattern_match {
&paths::RESULT_ERR,
"is_ok()",
"is_err()",
|| true,
|| true,
)
} else {
None
@ -1582,8 +1563,6 @@ mod redundant_pattern_match {
&paths::OPTION_NONE,
"is_some()",
"is_none()",
|| can_suggest(cx, hir_id, sym!(option_type), "is_some"),
|| can_suggest(cx, hir_id, sym!(option_type), "is_none"),
)
} else {
None
@ -1616,7 +1595,6 @@ mod redundant_pattern_match {
}
}
#[allow(clippy::too_many_arguments)]
fn find_good_method_for_match<'a>(
arms: &[Arm<'_>],
path_left: &QPath<'_>,
@ -1625,8 +1603,6 @@ mod redundant_pattern_match {
expected_right: &[&str],
should_be_left: &'a str,
should_be_right: &'a str,
can_suggest_left: impl Fn() -> bool,
can_suggest_right: impl Fn() -> bool,
) -> Option<&'a str> {
let body_node_pair = if match_qpath(path_left, expected_left) && match_qpath(path_right, expected_right) {
(&(*arms[0].body).kind, &(*arms[1].body).kind)
@ -1638,35 +1614,13 @@ mod redundant_pattern_match {
match body_node_pair {
(ExprKind::Lit(ref lit_left), ExprKind::Lit(ref lit_right)) => match (&lit_left.node, &lit_right.node) {
(LitKind::Bool(true), LitKind::Bool(false)) if can_suggest_left() => Some(should_be_left),
(LitKind::Bool(false), LitKind::Bool(true)) if can_suggest_right() => Some(should_be_right),
(LitKind::Bool(true), LitKind::Bool(false)) => Some(should_be_left),
(LitKind::Bool(false), LitKind::Bool(true)) => Some(should_be_right),
_ => None,
},
_ => None,
}
}
fn can_suggest(cx: &LateContext<'_>, hir_id: HirId, diag_item: Symbol, name: &str) -> bool {
if !in_constant(cx, hir_id) {
return true;
}
// Avoid suggesting calls to non-`const fn`s in const contexts, see #5697.
cx.tcx
.get_diagnostic_item(diag_item)
.and_then(|def_id| {
cx.tcx.inherent_impls(def_id).iter().find_map(|imp| {
cx.tcx
.associated_items(*imp)
.in_definition_order()
.find_map(|item| match item.kind {
ty::AssocKind::Fn if item.ident.name.as_str() == name => Some(item.def_id),
_ => None,
})
})
})
.map_or(false, |def_id| is_const_fn(cx.tcx, def_id))
}
}
#[test]