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+# Unused return enum
+
+### What it does
+
+It warns if a function that returns a Result type does not return the Result enum variant (Ok/Err).
+
+### Why is this bad?
+
+If any of the variants (Ok/Err) is not used, the code could be simplified or it could imply a bug.
+
+### Known problems
+
+If definitions of `Err()` and/or `Ok()` are in the code but do not flow to the return value due to the definition of a variable or because they are defined in a dead code block, the warning will not be shown. If the definitions are made in an auxiliary method, the warning will be shown, resulting in a false positive.
+
+### Example
+
+Instead of using:
+
+```rust
+#![no_std]
+
+use soroban_sdk::{contract, contracterror, contractimpl};
+
+#[contract]
+pub struct UnusedReturnEnum;
+
+#[contracterror]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
+#[repr(u32)]
+pub enum Error {
+    /// An overflow was produced.
+    Overflow = 1,
+}
+
+#[contractimpl]
+impl UnusedReturnEnum {
+    /// Returns the percentage difference between two values.
+    pub fn get_percentage_difference(balance1: u128, balance2: u128) -> Result<u128, Error> {
+        let absolute_difference = balance1.abs_diff(balance2);
+        let sum = balance1 + balance2;
+
+        match 100u128.checked_mul(absolute_difference / sum) {
+            Some(result) => result,
+            None => panic!("Overflow"),
+        };
+
+        Err(Error::Overflow)
+    }
+}
+```
+
+Use this:
+
+```rust
+#![no_std]
+
+use soroban_sdk::{contract, contracterror, contractimpl, testutils::arbitrary::arbitrary::Result};
+
+#[contract]
+pub struct UnusedReturnEnum;
+
+#[contracterror]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
+#[repr(u32)]
+pub enum Error {
+    /// An overflow was produced.
+    Overflow = 1,
+}
+
+#[contractimpl]
+impl UnusedReturnEnum {
+    /// Returns the percentage difference between two values.
+    pub fn get_percentage_difference(balance1: u128, balance2: u128) -> Result<u128, Error> {
+        let absolute_difference = balance1.abs_diff(balance2);
+        let sum = balance1 + balance2;
+
+        match 100u128.checked_mul(absolute_difference / sum) {
+            Some(result) => Ok(result),
+            None => Err(Error::Overflow),
+        }
+    }
+}
+```
+
+### Implementation
+
+The detector's implementation can be found at [this link](https://github.com/CoinFabrik/scout-soroban/tree/main/detectors/unused-return-enum).