Tweak wording to be more accurate

Author: estebank

src/librustc_resolve/late.rs

@@ -236,6 +236,9 @@ impl<'a> PathSource<'a> {
                         }
                         msg
                     }
+                    // This is a guess that `self` corresponds to the lhs.
+                    // This triggers on the lhs of `std::mem:size_of::<u32>();`.
+                    ExprKind::Type(..) => "value",
                     _ => "function",
                 },
                 _ => "value",

src/test/ui/type/ascription/issue-54516.rs

@@ -3,6 +3,6 @@ use std::collections::BTreeMap;
 fn main() {
     println!("{}", std::mem:size_of::<BTreeMap<u32, u32>>());
     //~^ ERROR casts cannot be followed by a function call
-    //~| ERROR expected function, found module `std::mem` [E0423]
+    //~| ERROR expected value, found module `std::mem` [E0423]
     //~| ERROR cannot find type `size_of` in this scope [E0412]
 }

src/test/ui/type/ascription/issue-54516.stderr

@@ -8,13 +8,13 @@ LL |     println!("{}", std::mem:size_of::<BTreeMap<u32, u32>>());
    |
    = note: `#![feature(type_ascription)]` lets you annotate an expression with a type: `<expr>: <type>`
 
-error[E0423]: expected function, found module `std::mem`
+error[E0423]: expected value, found module `std::mem`
   --> $DIR/issue-54516.rs:4:20
    |
 LL |     println!("{}", std::mem:size_of::<BTreeMap<u32, u32>>());
    |                    ^^^^^^^^- help: maybe you meant to write a path separator here: `::`
    |                    |
-   |                    not a function
+   |                    not a value
 
 error[E0412]: cannot find type `size_of` in this scope
   --> $DIR/issue-54516.rs:4:29

src/test/ui/type/ascription/issue-60933.rs

@@ -1,6 +1,6 @@
 fn main() {
     let u: usize = std::mem:size_of::<u32>();
     //~^ ERROR casts cannot be followed by a function call
-    //~| ERROR expected function, found module `std::mem` [E0423]
+    //~| ERROR expected value, found module `std::mem` [E0423]
     //~| ERROR cannot find type `size_of` in this scope [E0412]
 }

src/test/ui/type/ascription/issue-60933.stderr

@@ -8,13 +8,13 @@ LL |     let u: usize = std::mem:size_of::<u32>();
    |
    = note: `#![feature(type_ascription)]` lets you annotate an expression with a type: `<expr>: <type>`
 
-error[E0423]: expected function, found module `std::mem`
+error[E0423]: expected value, found module `std::mem`
   --> $DIR/issue-60933.rs:2:20
    |
 LL |     let u: usize = std::mem:size_of::<u32>();
    |                    ^^^^^^^^- help: maybe you meant to write a path separator here: `::`
    |                    |
-   |                    not a function
+   |                    not a value
 
 error[E0412]: cannot find type `size_of` in this scope
   --> $DIR/issue-60933.rs:2:29