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Suggest &s instead of s.as_str()

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This commit is contained in:
Phil Turnbull 2016-11-20 11:19:36 -05:00
parent 73a73638c0
commit e9f3911899
2 changed files with 7 additions and 7 deletions
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10
clippy_lints/src/methods.rs
View file

@ -511,7 +511,7 @@ declare_lint! {
/// let def = String::from("def");
/// let mut s = String::new();
/// s.push_str(abc);
/// s.push_str(def.as_str());
/// s.push_str(&def));
/// ```
declare_lint! {
@ -843,10 +843,10 @@ fn lint_string_extend(cx: &LateContext, expr: &hir::Expr, args: &MethodArgs) {
if let Some(arglists) = method_chain_args(arg, &["chars"]) {
let target = &arglists[0][0];
let (self_ty, _) = walk_ptrs_ty_depth(cx.tcx.tables().expr_ty(target));
let extra_suggestion = if self_ty.sty == ty::TyStr {
let ref_str = if self_ty.sty == ty::TyStr {
""
} else if match_type(cx, self_ty, &paths::STRING) {
".as_str()"
"&"
} else {
return;
};
@ -860,8 +860,8 @@ fn lint_string_extend(cx: &LateContext, expr: &hir::Expr, args: &MethodArgs) {
db.span_suggestion(expr.span, "try this",
format!("{}.push_str({}{})",
snippet(cx, args[0].span, "_"),
snippet(cx, target.span, "_"),
extra_suggestion));
ref_str,
snippet(cx, target.span, "_")));
});
}
}

4
tests/compile-fail/methods.rs
View file

@ -550,11 +550,11 @@ fn str_extend_chars() {
//~|HELP try this
//~|SUGGESTION s.push_str("abc")
s.push_str(def.as_str());
s.push_str(&def);
s.extend(def.chars());
//~^ERROR calling `.extend(_.chars())`
//~|HELP try this
//~|SUGGESTION s.push_str(def.as_str())
//~|SUGGESTION s.push_str(&def)
s.extend(abc.chars().skip(1));
s.extend("abc".chars().skip(1));