Collect test

dontcollectresulttest/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "dontcollectresulttest"
+version = "0.1.0"

dontcollectresulttest/Cargo.toml

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+[package]
+name = "dontcollectresulttest"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

dontcollectresulttest/README.md

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+# DontCollectResultTest
+
+Checking if one can change the way `.collect()` collects stuff by changing the
+expected resulting type.

dontcollectresulttest/src/main.rs

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+fn is_even(val: u8) -> Result<u8, u8> {
+    if val % 2 == 0 {
+        Ok(val)
+    } else {
+        Err(val)
+    }
+}
+fn main() {
+    let values = [2u8, 2, 2, 2, 2, 1];
+    println!(
+        "Result<Vec>: {:?}",
+        values
+            .iter()
+            .map(|x| is_even(*x))
+            .collect::<Result<Vec<u8>, u8>>()
+    );
+
+    print!(
+        "Vec<Result>: {:?}",
+        values
+            .iter()
+            .map(|x| is_even(*x))
+            .collect::<Vec<Result<u8, u8>>>()
+    );
+}