Smarter splitting around named collection arguments.

test/splitting/list_arguments.stmt

Index: test/splitting/list_arguments.stmt
diff --git a/test/splitting/list_arguments.stmt b/test/splitting/list_arguments.stmt
index 7206c5af4fac37529eb5d178f5a13d52be8d4d3b..82f69ba148728959af5729c59c44763c60197bf3 100644
--- a/test/splitting/list_arguments.stmt
+++ b/test/splitting/list_arguments.stmt
@@ -273,10 +273,35 @@ longFunctionName([
   element,
   element
 ]);
->>> nest trailing named if there are non-body named
-longFunctionName(a: argument, b: argument,
+>>> allow leadining non-collection to not split
+longFunctionName(a: arg, b: arg,
 c: [element, element, element, element], d: [element, element, element, element]);
 <<<
+longFunctionName(a: arg, b: arg, c: [
+  element,
+  element,
+  element,
+  element
+], d: [
+  element,
+  element,
+  element,
+  element
+]);
+>>> don't allow splitting before first arg while splitting collections
+longFunctionName(
+    a: argument, b: argument, c: [
+  element,
+  element,
+  element,
+  element
+], d: [
+  element,
+  element,
+  element,
+  element
+]);
+<<<
 longFunctionName(
     a: argument,
     b: argument,
@@ -292,6 +317,41 @@ longFunctionName(
       element,
       element
     ]);
+>>> trailing named arguments that do not split
+longFunctionName(a: [element, element, element, element],
+b: [element, element, element, element], c: argument, d: argument);
+<<<
+longFunctionName(a: [
+  element,
+  element,
+  element,
+  element
+], b: [
+  element,
+  element,
+  element,
+  element
+], c: argument, d: argument);
+>>> trailing named arguments that do split
+longFunctionName(a: [element, element, element, element],
+b: [element, element, element, element], c: argument, d: argument, e: argument);
+<<<
+longFunctionName(
+    a: [
+      element,
+      element,
+      element,
+      element
+    ],
+    b: [
+      element,
+      element,
+      element,
+      element
+    ],
+    c: argument,
+    d: argument,
+    e: argument);
 >>> leading named arguments
 longFunctionName(name1: [element, element], name2: [element, element], name3: argument, name4: argument);
 <<<