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88 changes: 88 additions & 0 deletions test.kt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,88 @@
package com.example.errorprone

import java.util.Random
import kotlin.collections.List

fun main(args: Array<String) {
val numbers = listOf(1, 2, 3
for i in numbers) {
println(i
}
Comment on lines +7 to +10
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⚠️ Potential issue

Fix multiple syntax errors in the main function.

The code has several syntax errors:

  • Missing closing parenthesis in listOf call
  • Missing opening parenthesis in for loop
  • Missing closing parenthesis in println call

Apply this diff to fix the syntax errors:

-    val numbers = listOf(1, 2, 3
-    for i in numbers) {
-        println(i
+    val numbers = listOf(1, 2, 3)
+    for (i in numbers) {
+        println(i)
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
val numbers = listOf(1, 2, 3
for i in numbers) {
println(i
}
val numbers = listOf(1, 2, 3)
for (i in numbers) {
println(i)
}
🤖 Prompt for AI Agents 
In test.kt around lines 7 to 10, fix the syntax errors by adding the missing
closing parenthesis to the listOf call, adding the missing opening parenthesis
in the for loop declaration, and adding the missing closing parenthesis in the
println call. Ensure the for loop syntax is correct with parentheses around the
iteration variable and the list.

val text: Int = "Hello"
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⚠️ Potential issue

Fix type mismatch: Cannot assign String to Int variable.

You're trying to assign a String literal to a variable declared as Int.

Apply this diff:

-    val text: Int = "Hello"
+    val text: String = "Hello"
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
val text: Int = "Hello"
val text: String = "Hello"
🤖 Prompt for AI Agents 
In test.kt at line 11, there is a type mismatch because a String literal "Hello"
is being assigned to a variable declared as Int. To fix this, either change the
variable type from Int to String or assign an integer value to the variable.
Ensure the variable type matches the assigned value type.

val maybeNull: String? = null
val length = maybeNull.length
Comment on lines +12 to +13
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⚠️ Potential issue

Add null safety check before accessing nullable property.

Accessing length on a nullable String without a null check will cause a NullPointerException.

Apply this diff:

-    val length = maybeNull.length
+    val length = maybeNull?.length ?: 0
🤖 Prompt for AI Agents 
In test.kt around lines 12 to 13, the code accesses the length property on a
nullable String without a null check, which can cause a NullPointerException.
Add a null safety check by using the safe call operator (?.) before accessing
length or use an explicit null check to ensure maybeNull is not null before
accessing its length.

val result = divide(10, 0)
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⚠️ Potential issue

Handle division by zero.

Calling divide(10, 0) will cause an ArithmeticException at runtime.

Either change the divisor to a non-zero value or add error handling in the divide function.

🤖 Prompt for AI Agents 
In test.kt at line 14, the code calls divide(10, 0), which causes a division by
zero error at runtime. To fix this, either change the divisor from 0 to a
non-zero value or modify the divide function to handle division by zero by
checking if the divisor is zero and returning an appropriate result or throwing
a controlled exception.

println("Result is: $result")
}

fun divide(a: Int, b: Int): Int {
return a / b
}
Comment on lines +18 to +20
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🛠️ Refactor suggestion

Add division by zero check.

The function should handle the case where the divisor is zero to prevent runtime exceptions.

Apply this diff:

 fun divide(a: Int, b: Int): Int {
+    if (b == 0) {
+        throw IllegalArgumentException("Division by zero")
+    }
     return a / b
 }
🤖 Prompt for AI Agents 
In test.kt around lines 18 to 20, the divide function currently does not check
for division by zero, which can cause runtime exceptions. Add a condition to
check if the divisor b is zero before performing the division. If b is zero,
handle it appropriately by either throwing an IllegalArgumentException or
returning a default value to prevent the exception.


class User(val name: String) {
var age: Int = "unknown"
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⚠️ Potential issue

Fix type mismatch in age property initialization.

Cannot assign String value to Int property.

Apply this diff:

-    var age: Int = "unknown"
+    var age: Int = 0  // or use a nullable Int? if age can be unknown
🤖 Prompt for AI Agents 
In test.kt at line 23, the age property is declared as an Int but is incorrectly
initialized with a String value "unknown". Change the initialization to an
integer value or use a nullable Int type if you need to represent an unknown
state. For example, initialize age with a valid integer or declare it as var
age: Int? = null to fix the type mismatch.

fun greet(): String {
println("Hello, $name")
}
Comment on lines +24 to +26
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⚠️ Potential issue

Add missing return statement.

Function is declared to return String but has no return statement.

Apply this diff:

 fun greet(): String {
     println("Hello, $name")
+    return "Hello, $name"
 }
🤖 Prompt for AI Agents 
In test.kt around lines 24 to 26, the function greet is declared to return a
String but currently lacks a return statement. Modify the function to return the
greeting string instead of just printing it. Replace the println call with a
return statement that returns the string "Hello, $name".

}

interface Worker {
fun work()
}

class Engineer: Worker {
override fun work {
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⚠️ Potential issue

Add missing parentheses in function declaration.

When overriding a function, parentheses are required even if there are no parameters.

Apply this diff:

-    override fun work {
+    override fun work() {
🤖 Prompt for AI Agents 
In test.kt at line 34, the overridden function declaration is missing
parentheses. Add empty parentheses after the function name 'work' to correctly
declare it as a function, even if it takes no parameters.

println("Working")
}
}

val lambdaExample = { x: Int -> x * 2
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⚠️ Potential issue

Add missing closing brace to lambda expression.

The lambda expression is missing its closing brace.

Apply this diff:

-val lambdaExample = { x: Int -> x * 2
+val lambdaExample = { x: Int -> x * 2 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
val lambdaExample = { x: Int -> x * 2
val lambdaExample = { x: Int -> x * 2 }
🤖 Prompt for AI Agents 
In test.kt at line 39, the lambda expression is missing its closing brace. Add a
closing brace '}' at the end of the lambda expression to properly close it.


fun missingReturn(): String {
val s = StringBuilder("Test")
}
Comment on lines +41 to +43
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⚠️ Potential issue

Add missing return statement.

Function is declared to return String but has no return statement.

Apply this diff:

 fun missingReturn(): String {
     val s = StringBuilder("Test")
+    return s.toString()
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun missingReturn(): String {
val s = StringBuilder("Test")
}
fun missingReturn(): String {
val s = StringBuilder("Test")
return s.toString()
}
🤖 Prompt for AI Agents 
In test.kt around lines 41 to 43, the function missingReturn is declared to
return a String but currently lacks a return statement. Fix this by adding a
return statement that returns a String value, for example, convert the
StringBuilder s to a String and return it at the end of the function.


fun genericExample(items: List<String>>): MutableList<String> {
val result = MutableList<String>()
return result
}
Comment on lines +45 to +48
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⚠️ Potential issue

Fix syntax errors in generic function.

The function has two syntax errors:

  1. Extra > in parameter type declaration
  2. Incorrect MutableList constructor usage

Apply this diff:

-fun genericExample(items: List<String>>): MutableList<String> {
-    val result = MutableList<String>()
+fun genericExample(items: List<String>): MutableList<String> {
+    val result = mutableListOf<String>()
     return result
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun genericExample(items: List<String>>): MutableList<String> {
val result = MutableList<String>()
return result
}
fun genericExample(items: List<String>): MutableList<String> {
val result = mutableListOf<String>()
return result
}
🤖 Prompt for AI Agents 
In test.kt around lines 45 to 48, fix the syntax errors in the genericExample
function by removing the extra '>' in the parameter type declaration and
correcting the MutableList constructor usage to properly initialize the list
with a size and initializer or use a suitable factory method.


var uninitialized: Double
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⚠️ Potential issue

Initialize the variable or make it nullable.

Non-nullable properties must be initialized at declaration.

Apply one of these fixes:

-var uninitialized: Double
+var uninitialized: Double = 0.0

Or make it nullable:

-var uninitialized: Double
+var uninitialized: Double? = null
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
var uninitialized: Double
var uninitialized: Double = 0.0
Suggested change
var uninitialized: Double
var uninitialized: Double? = null
🤖 Prompt for AI Agents 
In test.kt at line 50, the variable 'uninitialized' is declared as a
non-nullable Double without initialization, which is not allowed. Fix this by
either initializing 'uninitialized' with a default Double value at declaration
or by making the variable nullable by adding a '?' after the type to allow it to
hold null.


fun badWhen(x: Int): String {
when x {
1 -> "one"
2 -> "two"
else -> "many"
}
}
Comment on lines +52 to +58
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⚠️ Potential issue

Fix when expression to return a value.

The function is declared to return String but the when expression doesn't return anything.

Apply this diff:

 fun badWhen(x: Int): String {
-    when x {
+    return when (x) {
         1 -> "one"
         2 -> "two"
         else -> "many"
     }
 }
🧰 Tools
🪛 detekt (1.23.8)

[warning] 53-53: This when block is empty.

(detekt.empty-blocks.EmptyWhenBlock)

🤖 Prompt for AI Agents 
In test.kt around lines 52 to 58, the when expression is used incorrectly
without returning a value, but the function badWhen is declared to return a
String. Fix this by making the when expression an expression that returns a
String value directly, either by adding an equals sign before when or by
returning the when expression result explicitly.


fun mismatchedBraces() {
if (true) {
println("Oops")
}


Comment on lines +60 to +65
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⚠️ Potential issue

Add missing closing brace.

The function is missing its closing brace.

Apply this diff:

 fun mismatchedBraces() {
     if (true) {
         println("Oops")
     }
-  
-
+}
🤖 Prompt for AI Agents 
In test.kt around lines 60 to 65, the function mismatchedBraces is missing its
closing brace. Add a closing curly brace at the end of the function to properly
close it and fix the syntax error.

fun duplicateParam(name: String, name: Int): Unit {
println(name)
}
Comment on lines +66 to +68
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⚠️ Potential issue

Fix duplicate parameter names.

Function parameters must have unique names.

Apply this diff:

-fun duplicateParam(name: String, name: Int): Unit {
+fun duplicateParam(name: String, id: Int): Unit {
     println(name)
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun duplicateParam(name: String, name: Int): Unit {
println(name)
}
fun duplicateParam(name: String, id: Int): Unit {
println(name)
}
🤖 Prompt for AI Agents 
In test.kt around lines 66 to 68, the function duplicateParam has duplicate
parameter names which is invalid. Rename one of the parameters to have a unique
name so that each parameter in the function signature is distinct.


fun badNullable(a: Int?): Int {
return a // missing safe-call or assertion
}
Comment on lines +70 to +72
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⚠️ Potential issue

Handle nullable parameter properly.

Cannot return nullable Int? when function expects non-nullable Int.

Apply one of these fixes:

 fun badNullable(a: Int?): Int {
-    return a  // missing safe-call or assertion
+    return a ?: 0  // provide default value
 }

Or throw an exception for null values:

 fun badNullable(a: Int?): Int {
-    return a  // missing safe-call or assertion
+    return a ?: throw IllegalArgumentException("Parameter cannot be null")
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun badNullable(a: Int?): Int {
return a // missing safe-call or assertion
}
fun badNullable(a: Int?): Int {
return a ?: 0 // provide default value
}
Suggested change
fun badNullable(a: Int?): Int {
return a // missing safe-call or assertion
}
fun badNullable(a: Int?): Int {
return a ?: throw IllegalArgumentException("Parameter cannot be null")
}
🤖 Prompt for AI Agents 
In test.kt around lines 70 to 72, the function badNullable returns a nullable
Int? but the return type is non-nullable Int, causing a type mismatch. Fix this
by either using the safe-call operator with an Elvis operator to provide a
default value, using the non-null assertion operator (!!) if you are sure the
value is not null, or explicitly throwing an exception when a is null to handle
the null case properly.


fun wrongOverride(): Int {
super.toString()
}
Comment on lines +74 to +76
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⚠️ Potential issue

Fix invalid use of super and add return statement.

Cannot use super outside of a class context, and function must return an Int value.

This function needs to be either:

  1. Moved inside a class that extends another class, or
  2. Rewritten without using super

For now, here's a fix assuming it should return a simple value:

 fun wrongOverride(): Int {
-    super.toString()
+    return 0
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun wrongOverride(): Int {
super.toString()
}
fun wrongOverride(): Int {
return 0
}
🤖 Prompt for AI Agents 
In test.kt around lines 74 to 76, the function wrongOverride incorrectly uses
super outside of a class context and lacks a return statement. To fix this,
either move the function inside a class that extends another class so super can
be used properly, or remove the super call and add a return statement that
returns an Int value to satisfy the function's return type.


fun strayColon(): Unit:
println("Colon error")

Comment on lines +78 to +80
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⚠️ Potential issue

Remove extra colon after return type.

There's an extra colon after the return type declaration.

Apply this diff:

-fun strayColon(): Unit:
+fun strayColon(): Unit {
     println("Colon error")
+}
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun strayColon(): Unit:
println("Colon error")
fun strayColon(): Unit {
println("Colon error")
}
🤖 Prompt for AI Agents 
In test.kt around lines 78 to 80, remove the extra colon after the return type
declaration in the function signature of strayColon. Change the line from "fun
strayColon(): Unit:" to "fun strayColon(): Unit" to fix the syntax error.

fun unusedVar() {
val x = 10
}

fun extraParens()) {
println("Paren")
}
Comment on lines +85 to +87
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⚠️ Potential issue

Remove extra parenthesis in function declaration.

There's an extra closing parenthesis in the function declaration.

Apply this diff:

-fun extraParens()) {
+fun extraParens() {
     println("Paren")
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
fun extraParens()) {
println("Paren")
}
fun extraParens() {
println("Paren")
}
🤖 Prompt for AI Agents 
In test.kt around lines 85 to 87, the function declaration has an extra closing
parenthesis. Remove the extra closing parenthesis after the function name so
that the declaration is syntactically correct.