Enforce newline after assignment / clause.

This leads to more consistent formatting across entire Aiken programs.
  Before that commit, only long expressions would be formatted on a
  newline, causing non-consistent formatting and additional reading
  barrier when looking at source code.

  Programs also now take more vertical space, which is better for more
  friendly diffing in version control systems (especially git).

examples/acceptance_tests/068/lib/tests.ak

@@ -24,10 +24,10 @@ pub fn from_asset(
 ) -> Value {
   let asset =
     dict.new()
-    |> dict.insert(asset_name, quantity, bytearray.compare)
+      |> dict.insert(asset_name, quantity, bytearray.compare)
   dict.new()
-  |> dict.insert(policy_id, asset, bytearray.compare)
-  |> Value
+    |> dict.insert(policy_id, asset, bytearray.compare)
+    |> Value
 }
 
 pub fn add(left v0: Value, right v1: Value) -> Value {
@@ -40,7 +40,8 @@ pub fn add(left v0: Value, right v1: Value) -> Value {
           a0,
           a1,
           fn(_, q0, q1) {
-            let q = q0 + q1
+            let q =
+              q0 + q1
             if q == 0 {
               None
             } else {
@@ -58,7 +59,7 @@ pub fn add(left v0: Value, right v1: Value) -> Value {
     },
     bytearray.compare,
   )
-  |> Value
+    |> Value
 }
 
 /// Flatten a value as a list of results, possibly discarding some along the way.
@@ -75,8 +76,10 @@ pub fn flatten_with(
         asset,
         fn(asset_name, quantity, xs) {
           when transform(policy_id, asset_name, quantity) is {
-            None -> xs
-            Some(x) -> [x, ..xs]
+            None ->
+              xs
+            Some(x) ->
+              [x, ..xs]
           }
         },
         assets,
@@ -93,9 +96,9 @@ test flatten_with_1() {
 test flatten_with_2() {
   let v =
     zero()
-    |> add(from_asset("a", "1", 14))
-    |> add(from_asset("b", "", 42))
-    |> add(from_asset("a", "2", 42))
+      |> add(from_asset("a", "1", 14))
+      |> add(from_asset("b", "", 42))
+      |> add(from_asset("a", "2", 42))
 
   flatten_with(
     v,