Error(runtime::idents::not_callable)

  💥 Calling a non-function
   ╭─[tests/diagnostics/not_callable.oy:3:1]
 3 │ >}
 4 │ 
 5 │ ~main<argc><argv>{<
 6 │     my_var = foo<"Awiteb">;
   ·     ───────────┬──────────
   ·                ╰── This is not a function
 7 │     my_var<>;
   ·     ────┬───
   ·         ╰── And you tried to call it here
 8 │     return 0;
 9 │ >}
   ╰────
