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Don't suggest to move empty blocks

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This commit is contained in:
flip1995 2020-05-31 18:45:16 +02:00
parent 6d15a14964
commit a9cde3a804
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GPG Key ID: 693086869D506637
1 changed files with 30 additions and 13 deletions
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43
clippy_lints/src/types.rs
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@ -10,7 +10,7 @@ use rustc_errors::{Applicability, DiagnosticBuilder};
use rustc_hir as hir;
use rustc_hir::intravisit::{walk_body, walk_expr, walk_ty, FnKind, NestedVisitorMap, Visitor};
use rustc_hir::{
BinOpKind, Body, Expr, ExprKind, FnDecl, FnRetTy, FnSig, GenericArg, GenericParamKind, HirId, ImplItem,
BinOpKind, Block, Body, Expr, ExprKind, FnDecl, FnRetTy, FnSig, GenericArg, GenericParamKind, HirId, ImplItem,
ImplItemKind, Item, ItemKind, Lifetime, Local, MatchSource, MutTy, Mutability, QPath, Stmt, StmtKind, TraitFn,
TraitItem, TraitItemKind, TyKind, UnOp,
};
@ -29,10 +29,10 @@ use rustc_typeck::hir_ty_to_ty;
use crate::consts::{constant, Constant};
use crate::utils::paths;
use crate::utils::{
clip, comparisons, differing_macro_contexts, higher, in_constant, int_bits, is_type_diagnostic_item,
clip, comparisons, differing_macro_contexts, higher, in_constant, indent_of, int_bits, is_type_diagnostic_item,
last_path_segment, match_def_path, match_path, method_chain_args, multispan_sugg, numeric_literal::NumericLiteral,
qpath_res, same_tys, sext, snippet, snippet_opt, snippet_with_applicability, snippet_with_macro_callsite,
span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, unsext,
qpath_res, same_tys, sext, snippet, snippet_block_with_applicability, snippet_opt, snippet_with_applicability,
snippet_with_macro_callsite, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, unsext,
};
declare_clippy_lint! {
@ -847,6 +847,7 @@ fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[
});
let sugg = args_to_recover
.iter()
.filter(|arg| !is_empty_block(arg))
.enumerate()
.map(|(i, arg)| {
let indent = if i == 0 {
@ -860,16 +861,20 @@ fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[
snippet_block_with_applicability(cx, arg.span, "..", Some(expr.span), &mut applicability)
)
})
.collect::<Vec<String>>()
.join("\n");
db.span_suggestion(
expr.span.with_hi(expr.span.lo()),
&format!("{}move the expression{} in front of the call...", or, plural),
format!("{}\n", sugg),
applicability,
);
.collect::<Vec<String>>();
let mut and = "";
if !sugg.is_empty() {
let plural = if sugg.len() > 1 { "s" } else { "" };
db.span_suggestion(
expr.span.with_hi(expr.span.lo()),
&format!("{}move the expression{} in front of the call...", or, plural),
format!("{}\n", sugg.join("\n")),
applicability,
);
and = "...and "
}
db.multipart_suggestion(
&format!("...and use {}unit literal{} instead", singular, plural),
&format!("{}use {}unit literal{} instead", and, singular, plural),
args_to_recover
.iter()
.map(|arg| (arg.span, "()".to_string()))
@ -880,6 +885,18 @@ fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[
);
}
fn is_empty_block(expr: &Expr<'_>) -> bool {
matches!(
expr.kind,
ExprKind::Block(
Block {
stmts: &[], expr: None, ..
},
_,
)
)
}
fn is_questionmark_desugar_marked_call(expr: &Expr<'_>) -> bool {
use rustc_span::hygiene::DesugaringKind;
if let ExprKind::Call(ref callee, _) = expr.kind {