fix [manual_map] not catching type adjustment
This commit is contained in:
J-ZhengLi
J-ZhengLi
parent
75e3a2e905
commit
a2f9861df8
4 changed files with 302 additions and 17 deletions
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@ -40,9 +40,14 @@ fn main() {
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None => None,
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};
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// Lint. `s` is captured by reference, so no lifetime issues.
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let s = Some(String::new());
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// Lint. `s` is captured by reference, so no lifetime issues.
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let _ = s.as_ref().map(|x| { if let Some(ref s) = s { (x.clone(), s) } else { panic!() } });
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// Don't lint this, type of `s` is coercioned from `&String` to `&str`
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let x: Option<(String, &str)> = match &s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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};
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// Issue #7820
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unsafe fn f(x: u32) -> u32 {
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@ -54,3 +59,89 @@ fn main() {
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let _ = Some(0).map(|x| unsafe { f(x) });
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let _ = Some(0).map(|x| unsafe { f(x) });
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}
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// issue #12659
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mod with_type_coercion {
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trait DummyTrait {}
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fn foo<T: DummyTrait, F: Fn() -> Result<T, ()>>(f: F) {
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// Don't lint
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let _: Option<Result<Box<dyn DummyTrait>, ()>> = match Some(0) {
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Some(_) => Some(match f() {
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Ok(res) => Ok(Box::new(res)),
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_ => Err(()),
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}),
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None => None,
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};
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let _: Option<Box<&[u8]>> = match Some(()) {
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Some(_) => Some(Box::new(b"1234")),
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None => None,
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};
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let x = String::new();
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let _: Option<Box<&str>> = match Some(()) {
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Some(_) => Some(Box::new(&x)),
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None => None,
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};
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let _: Option<&str> = match Some(()) {
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Some(_) => Some(&x),
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None => None,
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};
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//~v ERROR: manual implementation of `Option::map`
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let _ = Some(0).map(|_| match f() {
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Ok(res) => Ok(Box::new(res)),
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_ => Err(()),
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});
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}
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#[allow(clippy::redundant_allocation)]
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fn bar() {
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fn f(_: Option<Box<&[u8]>>) {}
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fn g(b: &[u8]) -> Box<&[u8]> {
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Box::new(b)
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}
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let x: &[u8; 4] = b"1234";
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f(match Some(()) {
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Some(_) => Some(Box::new(x)),
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None => None,
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});
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//~v ERROR: manual implementation of `Option::map`
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let _: Option<Box<&[u8]>> = Some(0).map(|_| g(x));
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}
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fn with_fn_ret(s: &Option<String>) -> Option<(String, &str)> {
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// Don't lint, `map` doesn't work as the return type is adjusted.
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match s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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}
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}
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fn with_fn_ret_2(s: &Option<String>) -> Option<(String, &str)> {
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if true {
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// Don't lint, `map` doesn't work as the return type is adjusted.
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return match s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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};
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}
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None
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}
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#[allow(clippy::needless_late_init)]
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fn with_fn_ret_3<'a>(s: &'a Option<String>) -> Option<(String, &'a str)> {
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let x: Option<(String, &'a str)>;
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x = {
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match s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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}
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};
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x
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}
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}
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@ -43,12 +43,17 @@ fn main() {
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None => None,
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};
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// Lint. `s` is captured by reference, so no lifetime issues.
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let s = Some(String::new());
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// Lint. `s` is captured by reference, so no lifetime issues.
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let _ = match &s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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};
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// Don't lint this, type of `s` is coercioned from `&String` to `&str`
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let x: Option<(String, &str)> = match &s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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};
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// Issue #7820
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unsafe fn f(x: u32) -> u32 {
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@ -69,3 +74,95 @@ fn main() {
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None => None,
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};
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}
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// issue #12659
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mod with_type_coercion {
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trait DummyTrait {}
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fn foo<T: DummyTrait, F: Fn() -> Result<T, ()>>(f: F) {
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// Don't lint
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let _: Option<Result<Box<dyn DummyTrait>, ()>> = match Some(0) {
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Some(_) => Some(match f() {
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Ok(res) => Ok(Box::new(res)),
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_ => Err(()),
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}),
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None => None,
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};
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let _: Option<Box<&[u8]>> = match Some(()) {
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Some(_) => Some(Box::new(b"1234")),
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None => None,
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};
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let x = String::new();
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let _: Option<Box<&str>> = match Some(()) {
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Some(_) => Some(Box::new(&x)),
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None => None,
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};
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let _: Option<&str> = match Some(()) {
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Some(_) => Some(&x),
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None => None,
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};
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//~v ERROR: manual implementation of `Option::map`
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let _ = match Some(0) {
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Some(_) => Some(match f() {
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Ok(res) => Ok(Box::new(res)),
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_ => Err(()),
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}),
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None => None,
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};
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}
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#[allow(clippy::redundant_allocation)]
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fn bar() {
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fn f(_: Option<Box<&[u8]>>) {}
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fn g(b: &[u8]) -> Box<&[u8]> {
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Box::new(b)
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}
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let x: &[u8; 4] = b"1234";
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f(match Some(()) {
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Some(_) => Some(Box::new(x)),
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None => None,
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});
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//~v ERROR: manual implementation of `Option::map`
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let _: Option<Box<&[u8]>> = match Some(0) {
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Some(_) => Some(g(x)),
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None => None,
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};
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}
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fn with_fn_ret(s: &Option<String>) -> Option<(String, &str)> {
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// Don't lint, `map` doesn't work as the return type is adjusted.
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match s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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}
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}
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fn with_fn_ret_2(s: &Option<String>) -> Option<(String, &str)> {
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if true {
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// Don't lint, `map` doesn't work as the return type is adjusted.
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return match s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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};
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}
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None
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}
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#[allow(clippy::needless_late_init)]
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fn with_fn_ret_3<'a>(s: &'a Option<String>) -> Option<(String, &'a str)> {
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let x: Option<(String, &'a str)>;
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x = {
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match s {
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Some(x) => Some({ if let Some(ref s) = s { (x.clone(), s) } else { panic!() } }),
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None => None,
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}
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};
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x
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}
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}
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@ -32,7 +32,7 @@ LL | | };
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| |_____^ help: try: `s.as_ref().map(|x| { if let Some(ref s) = s { (x.clone(), s) } else { panic!() } })`
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error: manual implementation of `Option::map`
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--> tests/ui/manual_map_option_2.rs:58:17
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--> tests/ui/manual_map_option_2.rs:63:17
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LL | let _ = match Some(0) {
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| _________________^
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@ -42,7 +42,7 @@ LL | | };
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| |_________^ help: try: `Some(0).map(|x| f(x))`
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error: manual implementation of `Option::map`
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--> tests/ui/manual_map_option_2.rs:63:13
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--> tests/ui/manual_map_option_2.rs:68:13
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LL | let _ = match Some(0) {
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| _____________^
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@ -52,7 +52,7 @@ LL | | };
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| |_____^ help: try: `Some(0).map(|x| unsafe { f(x) })`
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error: manual implementation of `Option::map`
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--> tests/ui/manual_map_option_2.rs:67:13
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--> tests/ui/manual_map_option_2.rs:72:13
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LL | let _ = match Some(0) {
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| _____________^
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@ -61,5 +61,36 @@ LL | | None => None,
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LL | | };
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| |_____^ help: try: `Some(0).map(|x| unsafe { f(x) })`
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error: aborting due to 5 previous errors
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error: manual implementation of `Option::map`
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--> tests/ui/manual_map_option_2.rs:109:17
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LL | let _ = match Some(0) {
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| _________________^
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LL | | Some(_) => Some(match f() {
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LL | | Ok(res) => Ok(Box::new(res)),
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LL | | _ => Err(()),
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LL | | }),
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LL | | None => None,
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LL | | };
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| |_________^
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help: try
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LL ~ let _ = Some(0).map(|_| match f() {
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LL + Ok(res) => Ok(Box::new(res)),
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LL + _ => Err(()),
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LL ~ });
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error: manual implementation of `Option::map`
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--> tests/ui/manual_map_option_2.rs:132:37
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LL | let _: Option<Box<&[u8]>> = match Some(0) {
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| _____________________________________^
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LL | | Some(_) => Some(g(x)),
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LL | | None => None,
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LL | | };
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| |_________^ help: try: `Some(0).map(|_| g(x))`
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error: aborting due to 7 previous errors
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