Tweak wording of collect() on bad target type

src/libcore/iter/traits/collect.rs

@@ -91,9 +91,9 @@
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_on_unimplemented(
-    message="a collection of type `{Self}` cannot be built from an iterator \
+    message="a value of type `{Self}` cannot be built from an iterator \
              over elements of type `{A}`",
-    label="a collection of type `{Self}` cannot be built from `std::iter::Iterator<Item={A}>`",
+    label="value of type `{Self}` cannot be built from `std::iter::Iterator<Item={A}>`",
 )]
 pub trait FromIterator<A>: Sized {
     /// Creates a value from an iterator.

src/test/ui/type/type-check-defaults.rs

@@ -4,9 +4,9 @@ use std::ops::Add;
 
 struct Foo<T, U: FromIterator<T>>(T, U);
 struct WellFormed<Z = Foo<i32, i32>>(Z);
-//~^ ERROR a collection of type `i32` cannot be built from an iterator over elements of type `i32`
+//~^ ERROR a value of type `i32` cannot be built from an iterator over elements of type `i32`
 struct WellFormedNoBounds<Z:?Sized = Foo<i32, i32>>(Z);
-//~^ ERROR a collection of type `i32` cannot be built from an iterator over elements of type `i32`
+//~^ ERROR a value of type `i32` cannot be built from an iterator over elements of type `i32`
 
 struct Bounds<T:Copy=String>(T);
 //~^ ERROR the trait bound `std::string::String: std::marker::Copy` is not satisfied [E0277]

src/test/ui/type/type-check-defaults.stderr

@@ -1,21 +1,21 @@
-error[E0277]: a collection of type `i32` cannot be built from an iterator over elements of type `i32`
+error[E0277]: a value of type `i32` cannot be built from an iterator over elements of type `i32`
   --> $DIR/type-check-defaults.rs:6:19
    |
 LL | struct Foo<T, U: FromIterator<T>>(T, U);
    | ---------------------------------------- required by `Foo`
 LL | struct WellFormed<Z = Foo<i32, i32>>(Z);
-   |                   ^ a collection of type `i32` cannot be built from `std::iter::Iterator<Item=i32>`
+   |                   ^ value of type `i32` cannot be built from `std::iter::Iterator<Item=i32>`
    |
    = help: the trait `std::iter::FromIterator<i32>` is not implemented for `i32`
 
-error[E0277]: a collection of type `i32` cannot be built from an iterator over elements of type `i32`
+error[E0277]: a value of type `i32` cannot be built from an iterator over elements of type `i32`
   --> $DIR/type-check-defaults.rs:8:27
    |
 LL | struct Foo<T, U: FromIterator<T>>(T, U);
    | ---------------------------------------- required by `Foo`
 ...
 LL | struct WellFormedNoBounds<Z:?Sized = Foo<i32, i32>>(Z);
-   |                           ^ a collection of type `i32` cannot be built from `std::iter::Iterator<Item=i32>`
+   |                           ^ value of type `i32` cannot be built from `std::iter::Iterator<Item=i32>`
    |
    = help: the trait `std::iter::FromIterator<i32>` is not implemented for `i32`
 

src/test/ui/type/type-dependent-def-issue-49241.rs

@@ -3,5 +3,5 @@ fn main() {
     const l: usize = v.count(); //~ ERROR attempt to use a non-constant value in a constant
     let s: [u32; l] = v.into_iter().collect();
     //~^ ERROR evaluation of constant value failed
-    //~^^ ERROR a collection of type
+    //~^^ ERROR a value of type
 }

src/test/ui/type/type-dependent-def-issue-49241.stderr

@@ -10,11 +10,11 @@ error[E0080]: evaluation of constant value failed
 LL |     let s: [u32; l] = v.into_iter().collect();
    |                  ^ referenced constant has errors
 
-error[E0277]: a collection of type `[u32; _]` cannot be built from an iterator over elements of type `{integer}`
+error[E0277]: a value of type `[u32; _]` cannot be built from an iterator over elements of type `{integer}`
   --> $DIR/type-dependent-def-issue-49241.rs:4:37
    |
 LL |     let s: [u32; l] = v.into_iter().collect();
-   |                                     ^^^^^^^ a collection of type `[u32; _]` cannot be built from `std::iter::Iterator<Item={integer}>`
+   |                                     ^^^^^^^ value of type `[u32; _]` cannot be built from `std::iter::Iterator<Item={integer}>`
    |
    = help: the trait `std::iter::FromIterator<{integer}>` is not implemented for `[u32; _]`