Indent functions in named argument lists with non-functions.

test/splitting/function_arguments.stmt

 40 columns                              |
 >>> args before and after function do not force nesting
 method(first,() {fn;},third);
 <<<
 method(first, () {
   fn;
 }, third);
 >>> nothing but function args does not nest
 longFunctionName(() {;}, () {;}, () {;});
 <<<
@@ skipping 160 matching lines @@
 >>> args before and after functions split independently
 longFunction(argument, argument, argument, argument, argument,
 () {;}, () {;}, argument, argument, argument, argument, argument);
 <<<
 longFunction(argument, argument,
     argument, argument, argument, () {
   ;
 }, () {
   ;
 }, argument, argument, argument,
-    argument, argument);
+    argument, argument);
+>>> all named args with leading non-function forces functions to indent
+longFunction(a: argument, b: () {;}, c: () {;});
+<<<
+longFunction(
+    a: argument,
+    b: () {
+      ;
+    },
+    c: () {
+      ;
+    });
+>>> all named args with trailing non-function forces functions to indent
+longFunction(a: () {;}, b: () {;}, c: argument);
+<<<
+longFunction(
+    a: () {
+      ;
+    },
+    b: () {
+      ;
+    },
+    c: argument);