Don't trigger use_self in macros

clippy_lints/src/use_self.rs

@@ -1,4 +1,4 @@
-use crate::utils::{meets_msrv, qpath_res, snippet_opt, span_lint_and_sugg};
+use crate::utils::{in_macro, meets_msrv, qpath_res, snippet_opt, span_lint_and_sugg};
 use if_chain::if_chain;
 
 use rustc_errors::Applicability;
@@ -13,7 +13,6 @@ use rustc_hir::{
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::hir::map::Map;
-use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::{AssocKind, Ty};
 use rustc_semver::RustcVersion;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
@@ -232,7 +231,7 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
     }
 
     fn check_ty(&mut self, cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>) {
-        if in_external_macro(cx.sess(), hir_ty.span)
+        if in_macro(hir_ty.span)
             | in_impl(cx, hir_ty)
             | self.types_to_skip.contains(&hir_ty.hir_id)
             | !meets_msrv(self.msrv.as_ref(), &USE_SELF_MSRV)
@@ -274,7 +273,7 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
             }
         }
 
-        if in_external_macro(cx.sess(), expr.span) | !meets_msrv(self.msrv.as_ref(), &USE_SELF_MSRV) {
+        if in_macro(expr.span) | !meets_msrv(self.msrv.as_ref(), &USE_SELF_MSRV) {
             return;
         }
 

tests/ui/auxiliary/proc_macro_derive.rs

@@ -41,3 +41,15 @@ pub fn derive_foo(_input: TokenStream) -> TokenStream {
         }
     }
 }
+
+#[proc_macro_derive(StructAUseSelf)]
+pub fn derive_use_self(_input: TokenStream) -> proc_macro::TokenStream {
+    quote! {
+        struct A;
+        impl A {
+            fn new() -> A {
+                A
+            }
+        }
+    }
+}

tests/ui/use_self.fixed

@@ -1,10 +1,14 @@
 // run-rustfix
 // edition:2018
+// aux-build:proc_macro_derive.rs
 
 #![warn(clippy::use_self)]
 #![allow(dead_code)]
 #![allow(clippy::should_implement_trait, clippy::upper_case_acronyms, clippy::from_over_into)]
 
+#[macro_use]
+extern crate proc_macro_derive;
+
 fn main() {}
 
 mod use_self {
@@ -109,8 +113,8 @@ mod tuple_structs {
 mod macros {
     macro_rules! use_self_expand {
         () => {
-            fn new() -> Self {
+            fn new() -> Foo {
-                Self {}
+                Foo {}
             }
         };
     }
@@ -118,8 +122,11 @@ mod macros {
     struct Foo {}
 
     impl Foo {
-        use_self_expand!(); // Should lint in local macros
+        use_self_expand!(); // Should not lint in local macros
     }
+
+    #[derive(StructAUseSelf)] // Should not lint in derives
+    struct A;
 }
 
 mod nesting {

tests/ui/use_self.rs

@@ -1,10 +1,14 @@
 // run-rustfix
 // edition:2018
+// aux-build:proc_macro_derive.rs
 
 #![warn(clippy::use_self)]
 #![allow(dead_code)]
 #![allow(clippy::should_implement_trait, clippy::upper_case_acronyms, clippy::from_over_into)]
 
+#[macro_use]
+extern crate proc_macro_derive;
+
 fn main() {}
 
 mod use_self {
@@ -118,8 +122,11 @@ mod macros {
     struct Foo {}
 
     impl Foo {
-        use_self_expand!(); // Should lint in local macros
+        use_self_expand!(); // Should not lint in local macros
     }
+
+    #[derive(StructAUseSelf)] // Should not lint in derives
+    struct A;
 }
 
 mod nesting {

tests/ui/use_self.stderr

@@ -1,5 +1,5 @@
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:14:21
+  --> $DIR/use_self.rs:18:21
    |
 LL |         fn new() -> Foo {
    |                     ^^^ help: use the applicable keyword: `Self`
@@ -7,194 +7,172 @@ LL |         fn new() -> Foo {
    = note: `-D clippy::use-self` implied by `-D warnings`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:15:13
+  --> $DIR/use_self.rs:19:13
    |
 LL |             Foo {}
    |             ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:17:22
+  --> $DIR/use_self.rs:21:22
    |
 LL |         fn test() -> Foo {
    |                      ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:18:13
+  --> $DIR/use_self.rs:22:13
    |
 LL |             Foo::new()
    |             ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:23:25
+  --> $DIR/use_self.rs:27:25
    |
 LL |         fn default() -> Foo {
    |                         ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:24:13
+  --> $DIR/use_self.rs:28:13
    |
 LL |             Foo::new()
    |             ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:89:24
+  --> $DIR/use_self.rs:93:24
    |
 LL |         fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
    |                        ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:89:55
+  --> $DIR/use_self.rs:93:55
    |
 LL |         fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
    |                                                       ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:104:13
+  --> $DIR/use_self.rs:108:13
    |
 LL |             TS(0)
    |             ^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:112:25
+  --> $DIR/use_self.rs:143:29
-   |
-LL |             fn new() -> Foo {
-   |                         ^^^ help: use the applicable keyword: `Self`
-...
-LL |         use_self_expand!(); // Should lint in local macros
-   |         ------------------- in this macro invocation
-   |
-   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:113:17
-   |
-LL |                 Foo {}
-   |                 ^^^ help: use the applicable keyword: `Self`
-...
-LL |         use_self_expand!(); // Should lint in local macros
-   |         ------------------- in this macro invocation
-   |
-   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:136:29
    |
 LL |                 fn bar() -> Bar {
    |                             ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:137:21
+  --> $DIR/use_self.rs:144:21
    |
 LL |                     Bar { foo: Foo {} }
    |                     ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:148:21
+  --> $DIR/use_self.rs:155:21
    |
 LL |         fn baz() -> Foo {
    |                     ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:149:13
+  --> $DIR/use_self.rs:156:13
    |
 LL |             Foo {}
    |             ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:166:21
+  --> $DIR/use_self.rs:173:21
    |
 LL |             let _ = Enum::B(42);
    |                     ^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:167:21
+  --> $DIR/use_self.rs:174:21
    |
 LL |             let _ = Enum::C { field: true };
    |                     ^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:168:21
+  --> $DIR/use_self.rs:175:21
    |
 LL |             let _ = Enum::A;
    |                     ^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:210:13
+  --> $DIR/use_self.rs:217:13
    |
 LL |             nested::A::fun_1();
    |             ^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:211:13
+  --> $DIR/use_self.rs:218:13
    |
 LL |             nested::A::A;
    |             ^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:213:13
+  --> $DIR/use_self.rs:220:13
    |
 LL |             nested::A {};
    |             ^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:232:13
+  --> $DIR/use_self.rs:239:13
    |
 LL |             TestStruct::from_something()
    |             ^^^^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:246:25
+  --> $DIR/use_self.rs:253:25
    |
 LL |         async fn g() -> S {
    |                         ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:247:13
+  --> $DIR/use_self.rs:254:13
    |
 LL |             S {}
    |             ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:251:16
+  --> $DIR/use_self.rs:258:16
    |
 LL |             &p[S::A..S::B]
    |                ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:251:22
+  --> $DIR/use_self.rs:258:22
    |
 LL |             &p[S::A..S::B]
    |                      ^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:274:29
+  --> $DIR/use_self.rs:281:29
    |
 LL |         fn foo(value: T) -> Foo<T> {
    |                             ^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:275:13
+  --> $DIR/use_self.rs:282:13
    |
 LL |             Foo { value }
    |             ^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:312:21
+  --> $DIR/use_self.rs:319:21
    |
 LL |         type From = T::From;
    |                     ^^^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:313:19
+  --> $DIR/use_self.rs:320:19
    |
 LL |         type To = T::To;
    |                   ^^^^^ help: use the applicable keyword: `Self`
 
 error: unnecessary structure name repetition
-  --> $DIR/use_self.rs:450:13
+  --> $DIR/use_self.rs:457:13
    |
 LL |             A::new::<submod::B>(submod::B {})
    |             ^ help: use the applicable keyword: `Self`
 
-error: aborting due to 31 previous errors
+error: aborting due to 29 previous errors