mirror of
https://github.com/rust-lang/rust-clippy
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move string_extend tests
This commit is contained in:
Cameron Steffen
parent
6d94167014
commit
3356d121df
4 changed files with 171 additions and 172 deletions
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@ -189,15 +189,6 @@ impl IteratorFalsePositives {
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}
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}
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#[derive(Copy, Clone)]
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struct HasChars;
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impl HasChars {
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fn chars(self) -> std::str::Chars<'static> {
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"HasChars".chars()
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}
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}
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/// Checks implementation of `FILTER_NEXT` lint
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fn filter_next() {
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let v = vec![3, 2, 1, 0, -1, -2, -3];
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@ -431,25 +422,3 @@ struct MyError(()); // doesn't implement Debug
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struct MyErrorWithParam<T> {
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x: T
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}
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fn str_extend_chars() {
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let abc = "abc";
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let def = String::from("def");
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let mut s = String::new();
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s.push_str(abc);
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s.extend(abc.chars());
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s.push_str("abc");
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s.extend("abc".chars());
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s.push_str(&def);
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s.extend(def.chars());
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s.extend(abc.chars().skip(1));
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s.extend("abc".chars().skip(1));
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s.extend(['a', 'b', 'c'].iter());
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let f = HasChars;
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s.extend(f.chars());
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}
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@ -214,356 +214,336 @@ error: unnecessary structure name repetition
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| ^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`
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error: called `filter(p).next()` on an `Iterator`. This is more succinctly expressed by calling `.find(p)` instead.
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--> $DIR/methods.rs:206:13
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--> $DIR/methods.rs:197:13
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206 | let _ = v.iter().filter(|&x| *x < 0).next();
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197 | let _ = v.iter().filter(|&x| *x < 0).next();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `-D filter-next` implied by `-D warnings`
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= note: replace `filter(|&x| *x < 0).next()` with `find(|&x| *x < 0)`
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error: called `filter(p).next()` on an `Iterator`. This is more succinctly expressed by calling `.find(p)` instead.
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--> $DIR/methods.rs:209:13
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--> $DIR/methods.rs:200:13
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209 | let _ = v.iter().filter(|&x| {
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200 | let _ = v.iter().filter(|&x| {
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| _____________^
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210 | | *x < 0
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211 | | }
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212 | | ).next();
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201 | | *x < 0
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202 | | }
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203 | | ).next();
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| |___________________________^
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error: called `is_some()` after searching an `Iterator` with find. This is more succinctly expressed by calling `any()`.
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--> $DIR/methods.rs:224:13
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--> $DIR/methods.rs:215:13
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224 | let _ = v.iter().find(|&x| *x < 0).is_some();
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215 | let _ = v.iter().find(|&x| *x < 0).is_some();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `-D search-is-some` implied by `-D warnings`
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= note: replace `find(|&x| *x < 0).is_some()` with `any(|&x| *x < 0)`
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error: called `is_some()` after searching an `Iterator` with find. This is more succinctly expressed by calling `any()`.
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--> $DIR/methods.rs:227:13
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--> $DIR/methods.rs:218:13
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227 | let _ = v.iter().find(|&x| {
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218 | let _ = v.iter().find(|&x| {
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| _____________^
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228 | | *x < 0
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229 | | }
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230 | | ).is_some();
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219 | | *x < 0
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220 | | }
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221 | | ).is_some();
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| |______________________________^
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error: called `is_some()` after searching an `Iterator` with position. This is more succinctly expressed by calling `any()`.
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--> $DIR/methods.rs:233:13
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--> $DIR/methods.rs:224:13
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233 | let _ = v.iter().position(|&x| x < 0).is_some();
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224 | let _ = v.iter().position(|&x| x < 0).is_some();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: replace `position(|&x| x < 0).is_some()` with `any(|&x| x < 0)`
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error: called `is_some()` after searching an `Iterator` with position. This is more succinctly expressed by calling `any()`.
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--> $DIR/methods.rs:236:13
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--> $DIR/methods.rs:227:13
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236 | let _ = v.iter().position(|&x| {
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227 | let _ = v.iter().position(|&x| {
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| _____________^
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237 | | x < 0
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238 | | }
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239 | | ).is_some();
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228 | | x < 0
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229 | | }
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230 | | ).is_some();
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| |______________________________^
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error: called `is_some()` after searching an `Iterator` with rposition. This is more succinctly expressed by calling `any()`.
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--> $DIR/methods.rs:242:13
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--> $DIR/methods.rs:233:13
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242 | let _ = v.iter().rposition(|&x| x < 0).is_some();
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233 | let _ = v.iter().rposition(|&x| x < 0).is_some();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: replace `rposition(|&x| x < 0).is_some()` with `any(|&x| x < 0)`
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error: called `is_some()` after searching an `Iterator` with rposition. This is more succinctly expressed by calling `any()`.
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--> $DIR/methods.rs:245:13
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--> $DIR/methods.rs:236:13
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245 | let _ = v.iter().rposition(|&x| {
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236 | let _ = v.iter().rposition(|&x| {
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| _____________^
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246 | | x < 0
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247 | | }
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248 | | ).is_some();
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237 | | x < 0
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238 | | }
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239 | | ).is_some();
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| |______________________________^
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error: unnecessary structure name repetition
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--> $DIR/methods.rs:262:21
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--> $DIR/methods.rs:253:21
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262 | fn new() -> Foo { Foo }
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253 | fn new() -> Foo { Foo }
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| ^^^ help: use the applicable keyword: `Self`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:280:5
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--> $DIR/methods.rs:271:5
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280 | with_constructor.unwrap_or(make());
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271 | with_constructor.unwrap_or(make());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_constructor.unwrap_or_else(make)`
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= note: `-D or-fun-call` implied by `-D warnings`
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error: use of `unwrap_or` followed by a call to `new`
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--> $DIR/methods.rs:283:5
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--> $DIR/methods.rs:274:5
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283 | with_new.unwrap_or(Vec::new());
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274 | with_new.unwrap_or(Vec::new());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_new.unwrap_or_default()`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:286:5
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--> $DIR/methods.rs:277:5
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286 | with_const_args.unwrap_or(Vec::with_capacity(12));
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277 | with_const_args.unwrap_or(Vec::with_capacity(12));
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_const_args.unwrap_or_else(|| Vec::with_capacity(12))`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:280:5
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280 | with_err.unwrap_or(make());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err.unwrap_or_else(|_| make())`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:283:5
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283 | with_err_args.unwrap_or(Vec::with_capacity(12));
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err_args.unwrap_or_else(|_| Vec::with_capacity(12))`
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error: use of `unwrap_or` followed by a call to `default`
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--> $DIR/methods.rs:286:5
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286 | with_default_trait.unwrap_or(Default::default());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_trait.unwrap_or_default()`
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error: use of `unwrap_or` followed by a call to `default`
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--> $DIR/methods.rs:289:5
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289 | with_err.unwrap_or(make());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err.unwrap_or_else(|_| make())`
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289 | with_default_type.unwrap_or(u64::default());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_type.unwrap_or_default()`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:292:5
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292 | with_err_args.unwrap_or(Vec::with_capacity(12));
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err_args.unwrap_or_else(|_| Vec::with_capacity(12))`
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error: use of `unwrap_or` followed by a call to `default`
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--> $DIR/methods.rs:295:5
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295 | with_default_trait.unwrap_or(Default::default());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_trait.unwrap_or_default()`
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error: use of `unwrap_or` followed by a call to `default`
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--> $DIR/methods.rs:298:5
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298 | with_default_type.unwrap_or(u64::default());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_type.unwrap_or_default()`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:301:5
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301 | with_vec.unwrap_or(vec![]);
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292 | with_vec.unwrap_or(vec![]);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_vec.unwrap_or_else(|| < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ))`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:306:5
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--> $DIR/methods.rs:297:5
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306 | without_default.unwrap_or(Foo::new());
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297 | without_default.unwrap_or(Foo::new());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `without_default.unwrap_or_else(Foo::new)`
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error: use of `or_insert` followed by a function call
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--> $DIR/methods.rs:309:5
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--> $DIR/methods.rs:300:5
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309 | map.entry(42).or_insert(String::new());
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300 | map.entry(42).or_insert(String::new());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `map.entry(42).or_insert_with(String::new)`
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error: use of `or_insert` followed by a function call
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--> $DIR/methods.rs:312:5
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--> $DIR/methods.rs:303:5
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312 | btree.entry(42).or_insert(String::new());
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303 | btree.entry(42).or_insert(String::new());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `btree.entry(42).or_insert_with(String::new)`
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error: use of `unwrap_or` followed by a function call
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--> $DIR/methods.rs:315:13
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--> $DIR/methods.rs:306:13
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315 | let _ = stringy.unwrap_or("".to_owned());
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306 | let _ = stringy.unwrap_or("".to_owned());
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `stringy.unwrap_or_else(|| "".to_owned())`
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error: called `.iter().nth()` on a Vec. Calling `.get()` is both faster and more readable
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--> $DIR/methods.rs:326:23
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--> $DIR/methods.rs:317:23
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326 | let bad_vec = some_vec.iter().nth(3);
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317 | let bad_vec = some_vec.iter().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^
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= note: `-D iter-nth` implied by `-D warnings`
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error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
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--> $DIR/methods.rs:327:26
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--> $DIR/methods.rs:318:26
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327 | let bad_slice = &some_vec[..].iter().nth(3);
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318 | let bad_slice = &some_vec[..].iter().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
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--> $DIR/methods.rs:328:31
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--> $DIR/methods.rs:319:31
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328 | let bad_boxed_slice = boxed_slice.iter().nth(3);
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319 | let bad_boxed_slice = boxed_slice.iter().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `.iter().nth()` on a VecDeque. Calling `.get()` is both faster and more readable
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--> $DIR/methods.rs:329:29
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--> $DIR/methods.rs:320:29
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329 | let bad_vec_deque = some_vec_deque.iter().nth(3);
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320 | let bad_vec_deque = some_vec_deque.iter().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `.iter_mut().nth()` on a Vec. Calling `.get_mut()` is both faster and more readable
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--> $DIR/methods.rs:334:23
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--> $DIR/methods.rs:325:23
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334 | let bad_vec = some_vec.iter_mut().nth(3);
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325 | let bad_vec = some_vec.iter_mut().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `.iter_mut().nth()` on a slice. Calling `.get_mut()` is both faster and more readable
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--> $DIR/methods.rs:337:26
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--> $DIR/methods.rs:328:26
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337 | let bad_slice = &some_vec[..].iter_mut().nth(3);
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328 | let bad_slice = &some_vec[..].iter_mut().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `.iter_mut().nth()` on a VecDeque. Calling `.get_mut()` is both faster and more readable
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--> $DIR/methods.rs:340:29
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--> $DIR/methods.rs:331:29
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340 | let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
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331 | let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
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--> $DIR/methods.rs:352:13
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--> $DIR/methods.rs:343:13
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352 | let _ = some_vec.iter().skip(42).next();
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343 | let _ = some_vec.iter().skip(42).next();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: `-D iter-skip-next` implied by `-D warnings`
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error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
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--> $DIR/methods.rs:353:13
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--> $DIR/methods.rs:344:13
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353 | let _ = some_vec.iter().cycle().skip(42).next();
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344 | let _ = some_vec.iter().cycle().skip(42).next();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
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--> $DIR/methods.rs:354:13
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--> $DIR/methods.rs:345:13
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|
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354 | let _ = (1..10).skip(10).next();
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345 | let _ = (1..10).skip(10).next();
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| ^^^^^^^^^^^^^^^^^^^^^^^
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error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
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--> $DIR/methods.rs:355:14
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--> $DIR/methods.rs:346:14
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|
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355 | let _ = &some_vec[..].iter().skip(3).next();
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346 | let _ = &some_vec[..].iter().skip(3).next();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: called `.get().unwrap()` on a slice. Using `[]` is more clear and more concise
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--> $DIR/methods.rs:381:17
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--> $DIR/methods.rs:372:17
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|
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381 | let _ = boxed_slice.get(1).unwrap();
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372 | let _ = boxed_slice.get(1).unwrap();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&boxed_slice[1]`
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|
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= note: `-D get-unwrap` implied by `-D warnings`
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error: called `.get().unwrap()` on a slice. Using `[]` is more clear and more concise
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--> $DIR/methods.rs:382:17
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--> $DIR/methods.rs:373:17
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382 | let _ = some_slice.get(0).unwrap();
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373 | let _ = some_slice.get(0).unwrap();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_slice[0]`
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error: called `.get().unwrap()` on a Vec. Using `[]` is more clear and more concise
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--> $DIR/methods.rs:383:17
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--> $DIR/methods.rs:374:17
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383 | let _ = some_vec.get(0).unwrap();
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374 | let _ = some_vec.get(0).unwrap();
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| ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_vec[0]`
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error: called `.get().unwrap()` on a VecDeque. Using `[]` is more clear and more concise
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--> $DIR/methods.rs:384:17
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--> $DIR/methods.rs:375:17
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|
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384 | let _ = some_vecdeque.get(0).unwrap();
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375 | let _ = some_vecdeque.get(0).unwrap();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_vecdeque[0]`
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error: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
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--> $DIR/methods.rs:385:17
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--> $DIR/methods.rs:376:17
|
||||
|
|
||||
385 | let _ = some_hashmap.get(&1).unwrap();
|
||||
376 | let _ = some_hashmap.get(&1).unwrap();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_hashmap[&1]`
|
||||
|
||||
error: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
|
||||
--> $DIR/methods.rs:386:17
|
||||
--> $DIR/methods.rs:377:17
|
||||
|
|
||||
386 | let _ = some_btreemap.get(&1).unwrap();
|
||||
377 | let _ = some_btreemap.get(&1).unwrap();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_btreemap[&1]`
|
||||
|
||||
error: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
|
||||
--> $DIR/methods.rs:391:10
|
||||
--> $DIR/methods.rs:382:10
|
||||
|
|
||||
391 | *boxed_slice.get_mut(0).unwrap() = 1;
|
||||
382 | *boxed_slice.get_mut(0).unwrap() = 1;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut boxed_slice[0]`
|
||||
|
||||
error: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
|
||||
--> $DIR/methods.rs:392:10
|
||||
--> $DIR/methods.rs:383:10
|
||||
|
|
||||
392 | *some_slice.get_mut(0).unwrap() = 1;
|
||||
383 | *some_slice.get_mut(0).unwrap() = 1;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_slice[0]`
|
||||
|
||||
error: called `.get_mut().unwrap()` on a Vec. Using `[]` is more clear and more concise
|
||||
--> $DIR/methods.rs:393:10
|
||||
--> $DIR/methods.rs:384:10
|
||||
|
|
||||
393 | *some_vec.get_mut(0).unwrap() = 1;
|
||||
384 | *some_vec.get_mut(0).unwrap() = 1;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_vec[0]`
|
||||
|
||||
error: called `.get_mut().unwrap()` on a VecDeque. Using `[]` is more clear and more concise
|
||||
--> $DIR/methods.rs:394:10
|
||||
--> $DIR/methods.rs:385:10
|
||||
|
|
||||
394 | *some_vecdeque.get_mut(0).unwrap() = 1;
|
||||
385 | *some_vecdeque.get_mut(0).unwrap() = 1;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_vecdeque[0]`
|
||||
|
||||
error: used unwrap() on an Option value. If you don't want to handle the None case gracefully, consider using expect() to provide a better panic message
|
||||
--> $DIR/methods.rs:408:13
|
||||
--> $DIR/methods.rs:399:13
|
||||
|
|
||||
408 | let _ = opt.unwrap();
|
||||
399 | let _ = opt.unwrap();
|
||||
| ^^^^^^^^^^^^
|
||||
|
|
||||
= note: `-D option-unwrap-used` implied by `-D warnings`
|
||||
|
||||
error: used unwrap() on a Result value. If you don't want to handle the Err case gracefully, consider using expect() to provide a better panic message
|
||||
--> $DIR/methods.rs:411:13
|
||||
--> $DIR/methods.rs:402:13
|
||||
|
|
||||
411 | let _ = res.unwrap();
|
||||
402 | let _ = res.unwrap();
|
||||
| ^^^^^^^^^^^^
|
||||
|
|
||||
= note: `-D result-unwrap-used` implied by `-D warnings`
|
||||
|
||||
error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
|
||||
--> $DIR/methods.rs:413:5
|
||||
--> $DIR/methods.rs:404:5
|
||||
|
|
||||
413 | res.ok().expect("disaster!");
|
||||
404 | res.ok().expect("disaster!");
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= note: `-D ok-expect` implied by `-D warnings`
|
||||
|
||||
error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
|
||||
--> $DIR/methods.rs:419:5
|
||||
--> $DIR/methods.rs:410:5
|
||||
|
|
||||
419 | res3.ok().expect("whoof");
|
||||
410 | res3.ok().expect("whoof");
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
|
||||
--> $DIR/methods.rs:421:5
|
||||
--> $DIR/methods.rs:412:5
|
||||
|
|
||||
421 | res4.ok().expect("argh");
|
||||
412 | res4.ok().expect("argh");
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
|
||||
--> $DIR/methods.rs:423:5
|
||||
--> $DIR/methods.rs:414:5
|
||||
|
|
||||
423 | res5.ok().expect("oops");
|
||||
414 | res5.ok().expect("oops");
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
|
||||
--> $DIR/methods.rs:425:5
|
||||
--> $DIR/methods.rs:416:5
|
||||
|
|
||||
425 | res6.ok().expect("meh");
|
||||
416 | res6.ok().expect("meh");
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: calling `.extend(_.chars())`
|
||||
--> $DIR/methods.rs:441:5
|
||||
|
|
||||
441 | s.extend(abc.chars());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str(abc)`
|
||||
|
|
||||
= note: `-D string-extend-chars` implied by `-D warnings`
|
||||
|
||||
error: calling `.extend(_.chars())`
|
||||
--> $DIR/methods.rs:444:5
|
||||
|
|
||||
444 | s.extend("abc".chars());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str("abc")`
|
||||
|
||||
error: calling `.extend(_.chars())`
|
||||
--> $DIR/methods.rs:447:5
|
||||
|
|
||||
447 | s.extend(def.chars());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str(&def)`
|
||||
|
||||
|
|
|
|||
30
tests/ui/string_extend.rs
Normal file
30
tests/ui/string_extend.rs
Normal file
|
|
@ -0,0 +1,30 @@
|
|||
#[derive(Copy, Clone)]
|
||||
struct HasChars;
|
||||
|
||||
impl HasChars {
|
||||
fn chars(self) -> std::str::Chars<'static> {
|
||||
"HasChars".chars()
|
||||
}
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let abc = "abc";
|
||||
let def = String::from("def");
|
||||
let mut s = String::new();
|
||||
|
||||
s.push_str(abc);
|
||||
s.extend(abc.chars());
|
||||
|
||||
s.push_str("abc");
|
||||
s.extend("abc".chars());
|
||||
|
||||
s.push_str(&def);
|
||||
s.extend(def.chars());
|
||||
|
||||
s.extend(abc.chars().skip(1));
|
||||
s.extend("abc".chars().skip(1));
|
||||
s.extend(['a', 'b', 'c'].iter());
|
||||
|
||||
let f = HasChars;
|
||||
s.extend(f.chars());
|
||||
}
|
||||
20
tests/ui/string_extend.stderr
Normal file
20
tests/ui/string_extend.stderr
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
error: calling `.extend(_.chars())`
|
||||
--> $DIR/string_extend.rs:16:5
|
||||
|
|
||||
16 | s.extend(abc.chars());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str(abc)`
|
||||
|
|
||||
= note: `-D string-extend-chars` implied by `-D warnings`
|
||||
|
||||
error: calling `.extend(_.chars())`
|
||||
--> $DIR/string_extend.rs:19:5
|
||||
|
|
||||
19 | s.extend("abc".chars());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str("abc")`
|
||||
|
||||
error: calling `.extend(_.chars())`
|
||||
--> $DIR/string_extend.rs:22:5
|
||||
|
|
||||
22 | s.extend(def.chars());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str(&def)`
|
||||
|
||||
Loading…
Reference in a new issue