Fix

"not enough arguments in call to X"

Compiler Errors
2026-04-17T16:32:01+00:00
This error occurs when you call a function with fewer arguments than its definition requires, often due to a missing parameter, a mismatched variadic argument, or calling a method without the receiver.

This error occurs when you call a function with fewer arguments than its definition requires, often due to a missing parameter, a mismatched variadic argument, or calling a method without the receiver. You need to count the parameters in the function signature and ensure your call site provides exactly that many, or use the correct syntax for variadic functions and methods.

Here is a common scenario where a variadic function is called incorrectly, followed by a method call missing the receiver:

package main

import "fmt"

// Define a function expecting a string and a variadic int
func Log(message string, values ...int) {
	fmt.Println(message, values)
}

// Define a struct and a method
type User struct {
	Name string
}

// Method expects the receiver (u) plus one argument
func (u User) Greet(greeting string) {
	fmt.Printf("%s, %s\n", greeting, u.Name)
}

func main() {
	// ERROR: "not enough arguments in call to Log"
	// Missing the required 'message' string argument.
	// Log(1, 2, 3) 

	// FIX: Provide the required string argument before the variadic ints
	Log("User activity", 1, 2, 3)

	user := User{Name: "Alice"}

	// ERROR: "not enough arguments in call to user.Greet"
	// Calling as a function instead of a method, or missing the string argument.
	// user.Greet() 

	// FIX: Call as a method with the required string argument
	user.Greet("Hello")
}

If you are dealing with variadic functions, remember that the variadic part (the ... slice) is optional, but all preceding arguments are mandatory. If your function signature is func Do(a int, b ...string), you must provide at least one int. Calling Do("hello") fails because the first argument is a string, not an int, and even if types matched, omitting a entirely triggers this error.

For methods, the compiler often counts the receiver as an implicit argument. If you define func (m MyType) Run(), calling Run() directly without an instance of MyType will fail. You must call it on an instance: instance.Run(). If you accidentally pass the receiver as the first explicit argument (e.g., Run(instance)), you will get "too many arguments," but omitting the instance entirely or the required explicit parameters results in "not enough arguments."

Check your function signature in the definition file. Count the parameters before any ... and ensure your call site matches that count exactly. If you are passing a slice to a variadic parameter, remember to use the ... expansion operator (e.g., func(mySlice...)); passing the slice directly without ... counts as a single argument of type []T, which might not match the expected variadic signature if the function expects individual elements.