Rollup merge of #55102 - petrochenkov:trextra, r=nikomatsakis

resolve: Do not skip extern prelude during speculative resolution

Fixes https://github.com/rust-lang/rust/issues/54665

src/test/run-pass/extern/extern-prelude-no-speculative.rs

@@ -10,7 +10,7 @@
 
 // run-pass
 #![allow(unused_variables)]
-// compile-flags: --extern LooksLikeExternCrate=/path/to/nowhere
+// compile-flags: --extern LooksLikeExternCrate
 
 mod m {
     pub struct LooksLikeExternCrate;

src/test/ui/impl-trait/auxiliary/extra-item.rs

@@ -0,0 +1 @@
+pub trait MyTrait {}

src/test/ui/impl-trait/extra-item.rs

@@ -0,0 +1,10 @@
+// aux-build:extra-item.rs
+// compile-flags:--extern extra_item
+
+struct S;
+
+impl extra_item::MyTrait for S {
+    fn extra() {} //~ ERROR method `extra` is not a member of trait `extra_item::MyTrait`
+}
+
+fn main() {}

src/test/ui/impl-trait/extra-item.stderr

@@ -0,0 +1,9 @@
+error[E0407]: method `extra` is not a member of trait `extra_item::MyTrait`
+  --> $DIR/extra-item.rs:7:5
+   |
+LL |     fn extra() {} //~ ERROR method `extra` is not a member of trait `extra_item::MyTrait`
+   |     ^^^^^^^^^^^^^ not a member of trait `extra_item::MyTrait`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0407`.