---
source: kcl-lib/src/simulation_tests.rs
description: Error from executing argument_error.kcl
---
KCL Semantic error

  × semantic: f requires a value with type `fn(any): any`, but found an array
  │ of `number`, `number` (with type `[any; 2]`).
   ╭─[5:1]
 4 │ 
 5 │ map(f, f = [0, 1])
   · ─────────┬────────┬
   ·          │        ╰── tests/argument_error/input.kcl
   ·          ╰── tests/argument_error/input.kcl
   ╰────
  ╰─▶ KCL Semantic error
      
        × semantic: f requires a value with type `fn(any): any`, but found an
        │ array of `number`, `number` (with type `[any; 2]`).
         ╭─[5:12]
       4 │
       5 │ map(f, f = [0, 1])
         ·            ───┬──
         ·               ╰── tests/argument_error/input.kcl
         ╰────