== Why is this an issue?

The unit type `()` is always equal to itself and using it in comparisons is either redundant or a mistake, often caused by accidental semicolon placement.

=== Code examples

==== Noncompliant code example

[source,rust,diff-id=1,diff-type=noncompliant]
----
fn foo() {}
fn bar() {}
fn baz() {}

if {
    foo();
} == {
    bar();
} {
    baz();
} // Noncompliant: Comparing unit values.
----

==== Compliant solution

[source,rust,diff-id=1,diff-type=compliant]
----
fn foo() {}
fn bar() {}
fn baz() {}

foo();
bar();
baz(); // Compliant: No unit comparison.
----

== Resources
=== Documentation

* Clippy Lints - https://rust-lang.github.io/rust-clippy/master/index.html#unit_cmp