Invalid Error Code for Attempted to call something which isn't a function nor a method. [E0618]

[MahadMuhammad]

Invalid Error Code for Attempted to call something which isn't a function nor a method. - E0618

• Fixing this issue will help gccrs to emit error code similiar to rustc.
• Fixing this issue also help this PR [E0423] expected function, tuple struct or tuple variant, found struct #2432 to emit correct erorr code similiar to rustc.

---

I tried this code from E0618:

// https://doc.rust-lang.org/error_codes/E0618.html
#![allow(unused)]
fn main() {
enum X {
    Entry,
}

X::Entry(); // error: expected function, tuple struct or tuple variant,
            // found `X::Entry`

// Or even simpler:
let x = 0i32;
x(); // error: expected function, tuple struct or tuple variant, found `i32`
}

---

I expected to see this happen:

• Give error code similiar to rustc i.e. E0618,

➜  gccrs-build rustc ../mahad-testsuite/E0618.rs
error[E0618]: expected function, found enum variant `X::Entry`
 --> ../mahad-testsuite/E0618.rs:8:1
  |
5 |     Entry,
  |     ----- enum variant `X::Entry` defined here
...
8 | X::Entry(); // error: expected function, tuple struct or tuple variant,
  | ^^^^^^^^--
  | |
  | call expression requires function
  |
help: `X::Entry` is a unit enum variant, and does not take parentheses to be constructed
  |
8 - X::Entry(); // error: expected function, tuple struct or tuple variant,
8 + X::Entry; // error: expected function, tuple struct or tuple variant,
  |

error[E0618]: expected function, found `i32`
  --> ../mahad-testsuite/E0618.rs:13:1
   |
12 | let x = 0i32;
   |     - `x` has type `i32`
13 | x(); // error: expected function, tuple struct or tuple variant, found `i32`
   | ^--
   | |
   | call expression requires function

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0618`.

---

Instead, this happened:

• It gives different error code. E0425

➜  gccrs-build gcc/crab1 ../mahad-testsuite/E0618.rs 
../mahad-testsuite/E0618.rs:8:1: error: expected function, tuple struct or tuple variant, found struct ‘X’ [E0423]
    8 | X::Entry(); // error: expected function, tuple struct or tuple variant,
      | ^
../mahad-testsuite/E0618.rs:13:1: error: Failed to resolve expression of function call
   13 | x(); // error: expected function, tuple struct or tuple variant, found `i32`
      | ^

Analyzing compilation unit

Time variable                                   usr           sys          wall           GGC
 TOTAL                              :   0.00          0.00          0.00          146k
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.

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Originally posted by @MahadMuhammad in #2433 (comment)