Auto merge of #106183 - matthiaskrgr:rollup-ww6yzhi, r=matthiaskrgr

Rollup of 3 pull requests

Successful merges:

 - #105817 (Remove unreasonable help message for auto trait)
 - #105994 (Add regression test for #99647)
 - #106066 (Always suggest as `MachineApplicable` in `recover_intersection_pat`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_hir_typeck/src/method/probe.rs

@@ -973,6 +973,9 @@ fn assemble_extension_candidates_for_trait(
             });
         } else {
             debug_assert!(self.tcx.is_trait(trait_def_id));
+            if self.tcx.trait_is_auto(trait_def_id) {
+                return;
+            }
             for item in self.impl_or_trait_item(trait_def_id) {
                 // Check whether `trait_def_id` defines a method with suitable name.
                 if !self.has_applicable_self(&item) {

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -2306,6 +2306,7 @@ fn suggest_traits_to_import(
                         _ => false,
                     }
                 }) && (type_is_local || info.def_id.is_local())
+                    && !self.tcx.trait_is_auto(info.def_id)
                     && self
                         .associated_value(info.def_id, item_name)
                         .filter(|item| {

compiler/rustc_parse/src/parser/pat.rs

@@ -491,17 +491,6 @@ fn recover_intersection_pat(&mut self, lhs: P<Pat>) -> PResult<'a, P<Pat>> {
 
         if let PatKind::Ident(_, _, sub @ None) = &mut rhs.kind {
             // The user inverted the order, so help them fix that.
-            let mut applicability = Applicability::MachineApplicable;
-            // FIXME(bindings_after_at): Remove this code when stabilizing the feature.
-            lhs.walk(&mut |p| match p.kind {
-                // `check_match` is unhappy if the subpattern has a binding anywhere.
-                PatKind::Ident(..) => {
-                    applicability = Applicability::MaybeIncorrect;
-                    false // Short-circuit.
-                }
-                _ => true,
-            });
-
             let lhs_span = lhs.span;
             // Move the LHS into the RHS as a subpattern.
             // The RHS is now the full pattern.
@@ -510,7 +499,12 @@ fn recover_intersection_pat(&mut self, lhs: P<Pat>) -> PResult<'a, P<Pat>> {
             self.struct_span_err(sp, "pattern on wrong side of `@`")
                 .span_label(lhs_span, "pattern on the left, should be on the right")
                 .span_label(rhs.span, "binding on the right, should be on the left")
-                .span_suggestion(sp, "switch the order", pprust::pat_to_string(&rhs), applicability)
+                .span_suggestion(
+                    sp,
+                    "switch the order",
+                    pprust::pat_to_string(&rhs),
+                    Applicability::MachineApplicable,
+                )
                 .emit();
         } else {
             // The special case above doesn't apply so we may have e.g. `A(x) @ B(y)`.

src/test/ui/const-generics/generic_const_exprs/issue-99647.rs

@@ -0,0 +1,15 @@
+// edition:2018
+// run-pass
+
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+
+#[allow(unused)]
+async fn foo<'a>() {
+    let _data = &mut [0u8; { 1 + 4 }];
+    bar().await
+}
+
+async fn bar() {}
+
+fn main() {}

src/test/ui/methods/issues/issue-105732.rs

@@ -6,7 +6,8 @@
 
 trait Bar {
     fn f(&self) {
-        self.g(); //~ ERROR the method `g` exists for reference `&Self`, but its trait bounds were not satisfied
+        // issue #105788
+        self.g(); //~ ERROR no method named `g` found for reference `&Self` in the current scope
     }
 }
 

src/test/ui/methods/issues/issue-105732.stderr

@@ -6,21 +6,11 @@ LL | auto trait Foo {
 LL |     fn g(&self);
    |     ---^-------- help: remove these associated items
 
-error[E0599]: the method `g` exists for reference `&Self`, but its trait bounds were not satisfied
+error[E0599]: no method named `g` found for reference `&Self` in the current scope
-  --> $DIR/issue-105732.rs:9:14
+  --> $DIR/issue-105732.rs:10:14
    |
 LL |         self.g();
-   |              ^
+   |              ^ help: there is a method with a similar name: `f`
-   |
-   = note: the following trait bounds were not satisfied:
-           `Self: Foo`
-           which is required by `&Self: Foo`
-           `&Self: Foo`
-   = help: items from traits can only be used if the type parameter is bounded by the trait
-help: the following trait defines an item `g`, perhaps you need to add a supertrait for it:
-   |
-LL | trait Bar: Foo {
-   |          +++++
 
 error: aborting due to 2 previous errors
 

src/test/ui/parser/intersection-patterns-1.fixed

@@ -0,0 +1,35 @@
+// This tests the parser recovery in `recover_intersection_pat`
+// and serves as a regression test for the diagnostics issue #65400.
+//
+// The general idea is that for `$pat_lhs @ $pat_rhs` where
+// `$pat_lhs` is not generated by `ref? mut? $ident` we want
+// to suggest either switching the order or note that intersection
+// patterns are not allowed.
+
+// run-rustfix
+
+#![allow(unused_variables)]
+
+fn main() {
+    let s: Option<u8> = None;
+
+    match s {
+        y @ Some(x) => {}
+        //~^ ERROR pattern on wrong side of `@`
+        //~| pattern on the left, should be on the right
+        //~| binding on the right, should be on the left
+        //~| HELP switch the order
+        //~| SUGGESTION y @ Some(x)
+        _ => {}
+    }
+
+    match 2 {
+        e @ 1..=5 => {}
+        //~^ ERROR pattern on wrong side of `@`
+        //~| pattern on the left, should be on the right
+        //~| binding on the right, should be on the left
+        //~| HELP switch the order
+        //~| SUGGESTION e @ 1..=5
+        _ => {}
+    }
+}

src/test/ui/parser/intersection-patterns-1.rs

@@ -6,6 +6,10 @@
 // to suggest either switching the order or note that intersection
 // patterns are not allowed.
 
+// run-rustfix
+
+#![allow(unused_variables)]
+
 fn main() {
     let s: Option<u8> = None;
 
@@ -19,15 +23,6 @@ fn main() {
         _ => {}
     }
 
-    match s {
-        Some(x) @ Some(y) => {}
-        //~^ ERROR left-hand side of `@` must be a binding
-        //~| interpreted as a pattern, not a binding
-        //~| also a pattern
-        //~| NOTE bindings are `x`, `mut x`, `ref x`, and `ref mut x`
-        _ => {}
-    }
-
     match 2 {
         1 ..= 5 @ e => {}
         //~^ ERROR pattern on wrong side of `@`

src/test/ui/parser/intersection-patterns-1.stderr

@@ -1,5 +1,5 @@
 error: pattern on wrong side of `@`
-  --> $DIR/intersection-patterns.rs:13:9
+  --> $DIR/intersection-patterns-1.rs:17:9
    |
 LL |         Some(x) @ y => {}
    |         -------^^^-
@@ -8,19 +8,8 @@ LL |         Some(x) @ y => {}
    |         pattern on the left, should be on the right
    |         help: switch the order: `y @ Some(x)`
 
-error: left-hand side of `@` must be a binding
-  --> $DIR/intersection-patterns.rs:23:9
-   |
-LL |         Some(x) @ Some(y) => {}
-   |         -------^^^-------
-   |         |         |
-   |         |         also a pattern
-   |         interpreted as a pattern, not a binding
-   |
-   = note: bindings are `x`, `mut x`, `ref x`, and `ref mut x`
-
 error: pattern on wrong side of `@`
-  --> $DIR/intersection-patterns.rs:32:9
+  --> $DIR/intersection-patterns-1.rs:27:9
    |
 LL |         1 ..= 5 @ e => {}
    |         -------^^^-
@@ -29,5 +18,5 @@ LL |         1 ..= 5 @ e => {}
    |         pattern on the left, should be on the right
    |         help: switch the order: `e @ 1..=5`
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 

src/test/ui/parser/intersection-patterns-2.rs

@@ -0,0 +1,20 @@
+// This tests the parser recovery in `recover_intersection_pat`
+// and serves as a regression test for the diagnostics issue #65400.
+//
+// The general idea is that for `$pat_lhs @ $pat_rhs` where
+// `$pat_lhs` is not generated by `ref? mut? $ident` we want
+// to suggest either switching the order or note that intersection
+// patterns are not allowed.
+
+fn main() {
+    let s: Option<u8> = None;
+
+    match s {
+        Some(x) @ Some(y) => {}
+        //~^ ERROR left-hand side of `@` must be a binding
+        //~| interpreted as a pattern, not a binding
+        //~| also a pattern
+        //~| NOTE bindings are `x`, `mut x`, `ref x`, and `ref mut x`
+        _ => {}
+    }
+}

src/test/ui/parser/intersection-patterns-2.stderr

@@ -0,0 +1,13 @@
+error: left-hand side of `@` must be a binding
+  --> $DIR/intersection-patterns-2.rs:13:9
+   |
+LL |         Some(x) @ Some(y) => {}
+   |         -------^^^-------
+   |         |         |
+   |         |         also a pattern
+   |         interpreted as a pattern, not a binding
+   |
+   = note: bindings are `x`, `mut x`, `ref x`, and `ref mut x`
+
+error: aborting due to previous error
+