Some tests

tests/source/trailing-comma-never.rs

@@ -0,0 +1,41 @@
+// rustfmt-trailing_comma: Never
+
+enum X {
+    A,
+    B,
+}
+
+enum Y {
+    A,
+    B
+}
+
+enum TupX {
+    A(u32),
+    B(i32, u16),
+}
+
+enum TupY {
+    A(u32),
+    B(i32, u16)
+}
+
+enum StructX {
+    A {
+        s: u16,
+    },
+    B {
+        u: u32,
+        i: i32,
+    },
+}
+
+enum StructY {
+    A {
+        s: u16,
+    },
+    B {
+        u: u32,
+        i: i32,
+    }
+}

tests/source/trailing_commas.rs

@@ -0,0 +1,46 @@
+// rustfmt-trailing_comma: Always
+
+fn main() {
+    match foo {
+        x => {}
+        y => {
+            foo();
+        }
+        _ => x
+    }
+}
+
+fn f<S, T>(x: T, y: S) -> T where T: P, S: Q
+{
+    x
+}
+
+impl Trait for T where T: P
+{
+    fn f(x: T) -> T where T: Q + R
+    {
+        x
+    }
+}
+
+struct Pair<S, T> where T: P, S: P + Q {
+    a: T,
+    b: S
+}
+
+struct TupPair<S, T> (S, T) where T: P, S: P + Q;
+
+enum E<S, T> where S: P, T: P {
+    A {a: T},
+}
+
+type Double<T> where T: P, T: Q = Pair<T, T>;
+
+extern "C" {
+    fn f<S, T>(x: T, y: S) -> T where T: P, S: Q;
+}
+
+trait Q<S, T> where T: P, S: R
+{
+    fn f<U, V>(self, x: T, y: S, z: U) -> Self where U: P, V: P;
+}

tests/target/trailing-comma-never.rs

@@ -0,0 +1,31 @@
+// rustfmt-trailing_comma: Never
+
+enum X {
+    A,
+    B
+}
+
+enum Y {
+    A,
+    B
+}
+
+enum TupX {
+    A(u32),
+    B(i32, u16)
+}
+
+enum TupY {
+    A(u32),
+    B(i32, u16)
+}
+
+enum StructX {
+    A { s: u16 },
+    B { u: u32, i: i32 }
+}
+
+enum StructY {
+    A { s: u16 },
+    B { u: u32, i: i32 }
+}

tests/target/trailing_commas.rs

@@ -0,0 +1,66 @@
+// rustfmt-trailing_comma: Always
+
+fn main() {
+    match foo {
+        x => {},
+        y => {
+            foo();
+        },
+        _ => x,
+    }
+}
+
+fn f<S, T>(x: T, y: S) -> T
+    where T: P,
+          S: Q,
+{
+    x
+}
+
+impl Trait for T
+    where T: P,
+{
+    fn f(x: T) -> T
+        where T: Q + R,
+    {
+        x
+    }
+}
+
+struct Pair<S, T>
+    where T: P,
+          S: P + Q,
+{
+    a: T,
+    b: S,
+}
+
+struct TupPair<S, T>(S, T)
+    where T: P,
+          S: P + Q;
+
+enum E<S, T>
+    where S: P,
+          T: P,
+{
+    A { a: T, },
+}
+
+type Double<T>
+    where T: P,
+          T: Q = Pair<T, T>;
+
+extern "C" {
+    fn f<S, T>(x: T, y: S) -> T
+        where T: P,
+              S: Q;
+}
+
+trait Q<S, T>
+    where T: P,
+          S: R,
+{
+    fn f<U, V>(self, x: T, y: S, z: U) -> Self
+        where U: P,
+              V: P;
+}