tests/ui: A New Order [12/N]

tests/ui/associated-types/unconstrained-lifetime-assoc-type.rs

@@ -0,0 +1,21 @@
+//! Regression test for issue #22077
+//! lifetime parameters must be constrained in associated type definitions
+
+trait Fun {
+    type Output;
+    fn call<'x>(&'x self) -> Self::Output;
+}
+
+struct Holder {
+    x: String,
+}
+
+impl<'a> Fun for Holder {
+    //~^ ERROR E0207
+    type Output = &'a str;
+    fn call<'b>(&'b self) -> &'b str {
+        &self.x[..]
+    }
+}
+
+fn main() {}

tests/ui/impl-unused-rps-in-assoc-type.stderr → tests/ui/associated-types/unconstrained-lifetime-assoc-type.stderr

@@ -1,5 +1,5 @@
 error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/impl-unused-rps-in-assoc-type.rs:11:6
+  --> $DIR/unconstrained-lifetime-assoc-type.rs:13:6
    |
 LL | impl<'a> Fun for Holder {
    |      ^^ unconstrained lifetime parameter

tests/ui/inline-disallow-on-variant.rs → tests/ui/attributes/inline-attribute-enum-variant-error.rs

@@ -1,3 +1,5 @@
+//! Test that #[inline] attribute cannot be applied to enum variants
+
 enum Foo {
     #[inline]
     //~^ ERROR attribute should be applied

tests/ui/inline-disallow-on-variant.stderr → tests/ui/attributes/inline-attribute-enum-variant-error.stderr

@@ -1,5 +1,5 @@
 error[E0518]: attribute should be applied to function or closure
-  --> $DIR/inline-disallow-on-variant.rs:2:5
+  --> $DIR/inline-attribute-enum-variant-error.rs:4:5
    |
 LL |     #[inline]
    |     ^^^^^^^^^

tests/ui/attributes/inline-main.rs

@@ -0,0 +1,6 @@
+//! Test that #[inline(always)] can be applied to main function
+
+//@ run-pass
+
+#[inline(always)]
+fn main() {}

tests/ui/generics/unconstrained-type-params-inherent-impl.rs

@@ -0,0 +1,32 @@
+//! Test for unconstrained type parameters in inherent implementations
+
+struct MyType;
+
+struct MyType1<T>(T);
+
+trait Bar {
+    type Out;
+}
+
+impl<T> MyType {
+    //~^ ERROR the type parameter `T` is not constrained
+    // T is completely unused - this should fail
+}
+
+impl<T> MyType1<T> {
+    // OK: T is used in the self type `MyType1<T>`
+}
+
+impl<T, U> MyType1<T> {
+    //~^ ERROR the type parameter `U` is not constrained
+    // T is used in self type, but U is unconstrained - this should fail
+}
+
+impl<T, U> MyType1<T>
+where
+    T: Bar<Out = U>,
+{
+    // OK: T is used in self type, U is constrained through the where clause
+}
+
+fn main() {}

tests/ui/impl-unused-tps-inherent.stderr → tests/ui/generics/unconstrained-type-params-inherent-impl.stderr

@@ -1,14 +1,14 @@
 error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/impl-unused-tps-inherent.rs:9:6
+  --> $DIR/unconstrained-type-params-inherent-impl.rs:11:6
    |
 LL | impl<T> MyType {
    |      ^ unconstrained type parameter
 
 error[E0207]: the type parameter `U` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/impl-unused-tps-inherent.rs:17:8
+  --> $DIR/unconstrained-type-params-inherent-impl.rs:20:9
    |
-LL | impl<T,U> MyType1<T> {
-   |        ^ unconstrained type parameter
+LL | impl<T, U> MyType1<T> {
+   |         ^ unconstrained type parameter
 
 error: aborting due to 2 previous errors
 

tests/ui/methods/method-value-without-call.rs

@@ -0,0 +1,33 @@
+//! Test taking a method value without parentheses
+
+struct Point {
+    x: isize,
+    y: isize,
+}
+
+impl Point {
+    fn new() -> Point {
+        Point { x: 0, y: 0 }
+    }
+
+    fn get_x(&self) -> isize {
+        self.x
+    }
+}
+
+fn main() {
+    // Test with primitive type method
+    let _f = 10i32.abs; //~ ERROR attempted to take value of method
+
+    // Test with custom type method
+    let point: Point = Point::new();
+    let px: isize = point.get_x; //~ ERROR attempted to take value of method `get_x` on type `Point`
+
+    // Test with method chains - ensure the span is useful
+    let ys = &[1, 2, 3, 4, 5, 6, 7];
+    let a = ys
+        .iter()
+        .map(|x| x)
+        .filter(|&&x| x == 1)
+        .filter_map; //~ ERROR attempted to take value of method `filter_map` on type
+}

tests/ui/methods/method-value-without-call.stderr

@@ -0,0 +1,36 @@
+error[E0615]: attempted to take value of method `abs` on type `i32`
+  --> $DIR/method-value-without-call.rs:20:20
+   |
+LL |     let _f = 10i32.abs;
+   |                    ^^^ method, not a field
+   |
+help: use parentheses to call the method
+   |
+LL |     let _f = 10i32.abs();
+   |                       ++
+
+error[E0615]: attempted to take value of method `get_x` on type `Point`
+  --> $DIR/method-value-without-call.rs:24:27
+   |
+LL |     let px: isize = point.get_x;
+   |                           ^^^^^ method, not a field
+   |
+help: use parentheses to call the method
+   |
+LL |     let px: isize = point.get_x();
+   |                                ++
+
+error[E0615]: attempted to take value of method `filter_map` on type `Filter<Map<std::slice::Iter<'_, {integer}>, {closure@$DIR/method-value-without-call.rs:30:14: 30:17}>, {closure@$DIR/method-value-without-call.rs:31:17: 31:22}>`
+  --> $DIR/method-value-without-call.rs:32:10
+   |
+LL |         .filter_map;
+   |          ^^^^^^^^^^ method, not a field
+   |
+help: use parentheses to call the method
+   |
+LL |         .filter_map(_);
+   |                    +++
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0615`.

tests/ui/impl-unused-tps.rs → tests/ui/traits/constrained-type-params-trait-impl.rs

@@ -1,3 +1,11 @@
+//! Comprehensive test for type parameter constraints in trait implementations
+//!
+//! This tests various scenarios of type parameter usage in trait implementations:
+//! - Properly constrained parameters through trait bounds
+//! - Unconstrained parameters that should cause compilation errors
+//! - Complex constraint scenarios with `where` clauses and associated types
+//! - Conflicting implementations detection
+
 trait Foo<A> {
     fn get(&self, A: &A) {}
 }
@@ -7,34 +15,34 @@ trait Bar {
 }
 
 impl<T> Foo<T> for [isize; 0] {
-    // OK, T is used in `Foo<T>`.
+    // OK: T is used in the trait bound `Foo<T>`
 }
 
 impl<T, U> Foo<T> for [isize; 1] {
     //~^ ERROR the type parameter `U` is not constrained
+    // T is constrained by `Foo<T>`, but U is completely unused
 }
 
 impl<T, U> Foo<T> for [isize; 2]
 where
     T: Bar<Out = U>,
 {
-    // OK, `U` is now constrained by the output type parameter.
+    // OK: T is constrained by `Foo<T>`, U is constrained by the where clause
 }
 
 impl<T: Bar<Out = U>, U> Foo<T> for [isize; 3] {
-    // OK, same as above but written differently.
+    // OK: Same as above but using bound syntax instead of where clause
 }
 
 impl<T, U> Foo<T> for U {
     //~^ ERROR conflicting implementations of trait `Foo<_>` for type `[isize; 0]`
+    // This conflicts with the first impl when U = [isize; 0]
 }
 
 impl<T, U> Bar for T {
     //~^ ERROR the type parameter `U` is not constrained
-
     type Out = U;
-
-    // Using `U` in an associated type within the impl is not good enough!
+    // Using U only in associated type definition is insufficient for constraint
 }
 
 impl<T, U> Bar for T
@@ -43,7 +51,7 @@ where
 {
     //~^^^^ ERROR the type parameter `U` is not constrained by the impl trait, self type, or predicates
     //~| ERROR conflicting implementations of trait `Bar`
-    // This crafty self-referential attempt is still no good.
+    // Self-referential constraint doesn't properly constrain U
 }
 
 impl<T, U, V> Foo<T> for T
@@ -53,17 +61,15 @@ where
     //~^^^^ ERROR the type parameter `U` is not constrained
     //~| ERROR the type parameter `V` is not constrained
     //~| ERROR conflicting implementations of trait `Foo<[isize; 0]>` for type `[isize; 0]`
-
-    // Here, `V` is bound by an output type parameter, but the inputs
-    // are not themselves constrained.
+    // V is bound through output type, but U and V are not properly constrained as inputs
 }
 
 impl<T, U, V> Foo<(T, U)> for T
 where
     (T, U): Bar<Out = V>,
 {
     //~^^^^ ERROR conflicting implementations of trait `Foo<([isize; 0], _)>` for type `[isize; 0]`
-    // As above, but both T and U ARE constrained.
+    // Both T and U are constrained through `Foo<(T, U)>`, but creates conflicting impl
 }
 
 fn main() {}