Rollup merge of #95751 - compiler-errors:ambig-int, r=jackh726

Don't report numeric inference ambiguity when we have previous errors

Fixes #95648

src/test/ui/traits/no-fallback-multiple-impls.rs

@@ -0,0 +1,16 @@
+trait Fallback {
+    fn foo(&self) {}
+}
+
+impl Fallback for i32 {}
+
+impl Fallback for u64 {}
+
+impl Fallback for usize {}
+
+fn main() {
+    missing();
+    //~^ ERROR cannot find function `missing` in this scope
+    0.foo();
+    // But then we shouldn't report an inference ambiguity here...
+}

src/test/ui/traits/no-fallback-multiple-impls.stderr

@@ -0,0 +1,9 @@
+error[E0425]: cannot find function `missing` in this scope
+  --> $DIR/no-fallback-multiple-impls.rs:12:5
+   |
+LL |     missing();
+   |     ^^^^^^^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0425`.

src/test/ui/traits/test-2.rs

@@ -6,9 +6,9 @@ impl bar for i32 { fn dup(&self) -> i32 { *self } fn blah<X>(&self) {} }
 impl bar for u32 { fn dup(&self) -> u32 { *self } fn blah<X>(&self) {} }
 
 fn main() {
-    10.dup::<i32>(); //~ ERROR type annotations needed
+    10.dup::<i32>();
     //~^ ERROR this associated function takes 0 generic arguments but 1
-    10.blah::<i32, i32>(); //~ ERROR type annotations needed
+    10.blah::<i32, i32>();
     //~^ ERROR this associated function takes 1 generic argument but 2
     (Box::new(10) as Box<dyn bar>).dup();
     //~^ ERROR E0038

src/test/ui/traits/test-2.stderr

@@ -79,35 +79,7 @@ LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
    = note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn bar>>` for `Box<{integer}>`
    = note: required by cast to type `Box<dyn bar>`
 
-error[E0283]: type annotations needed
-  --> $DIR/test-2.rs:9:8
-   |
-LL |     10.dup::<i32>();
-   |        ^^^ cannot infer type for type `{integer}`
-   |
-note: multiple `impl`s satisfying `{integer}: bar` found
-  --> $DIR/test-2.rs:5:1
-   |
-LL | impl bar for i32 { fn dup(&self) -> i32 { *self } fn blah<X>(&self) {} }
-   | ^^^^^^^^^^^^^^^^
-LL | impl bar for u32 { fn dup(&self) -> u32 { *self } fn blah<X>(&self) {} }
-   | ^^^^^^^^^^^^^^^^
+error: aborting due to 5 previous errors
 
-error[E0283]: type annotations needed
-  --> $DIR/test-2.rs:11:8
-   |
-LL |     10.blah::<i32, i32>();
-   |        ^^^^ cannot infer type for type `{integer}`
-   |
-note: multiple `impl`s satisfying `{integer}: bar` found
-  --> $DIR/test-2.rs:5:1
-   |
-LL | impl bar for i32 { fn dup(&self) -> i32 { *self } fn blah<X>(&self) {} }
-   | ^^^^^^^^^^^^^^^^
-LL | impl bar for u32 { fn dup(&self) -> u32 { *self } fn blah<X>(&self) {} }
-   | ^^^^^^^^^^^^^^^^
-
-error: aborting due to 7 previous errors
-
-Some errors have detailed explanations: E0038, E0107, E0283.
+Some errors have detailed explanations: E0038, E0107.
 For more information about an error, try `rustc --explain E0038`.