Fix placement of dictionary unpacking inside dict literals

Fixes #111

README.md

@@ -495,6 +495,8 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md).
 
 * fixed parsing of unaligned standalone comments (#99, #112)
 
+* fixed placement of dictionary unpacking inside dictionary literals (#111)
+
 ### 18.4a1
 
 * added `--quiet` (#78)

black.py

@@ -1498,7 +1498,7 @@ def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
     if (
         leaf.type in VARARGS
         and leaf.parent
-        and leaf.parent.type in {syms.argument, syms.typedargslist}
+        and leaf.parent.type in {syms.argument, syms.typedargslist, syms.dictsetmaker}
     ):
         # * and ** might also be MATH_OPERATORS but in this case they are not.
         # Don't treat them as a delimiter.

tests/expression.diff

@@ -103,7 +103,7 @@
  ]
  slice[0]
  slice[0:1]
-@@ -114,78 +123,104 @@
+@@ -114,79 +123,113 @@
  numpy[-(c + 1):, d]
  numpy[:, l[-2]]
  numpy[:, ::-1]
@@ -123,6 +123,16 @@
 +((i ** 2) for i, _ in ((1, "a"), (2, "b"), (3, "c")))
  (((i ** 2) + j) for i in (1, 2, 3) for j in (1, 2, 3))
  (*starred)
+-{"id": "1","type": "type","started_at": now(),"ended_at": now() + timedelta(days=10),"priority": 1,"import_session_id": 1,**kwargs}  # no trailing comma, this file is not 3.6+
++{
++    "id": "1",
++    "type": "type",
++    "started_at": now(),
++    "ended_at": now() + timedelta(days=10),
++    "priority": 1,
++    "import_session_id": 1,
++    **kwargs
++}  # no trailing comma, this file is not 3.6+
  a = (1,)
  b = 1,
  c = 1

tests/expression.py

@@ -127,6 +127,7 @@
 ((i ** 2) for i, _ in ((1, 'a'), (2, 'b'), (3, 'c')))
 (((i ** 2) + j) for i in (1, 2, 3) for j in (1, 2, 3))
 (*starred)
+{"id": "1","type": "type","started_at": now(),"ended_at": now() + timedelta(days=10),"priority": 1,"import_session_id": 1,**kwargs}  # no trailing comma, this file is not 3.6+
 a = (1,)
 b = 1,
 c = 1
@@ -331,6 +332,15 @@ async def f():
 ((i ** 2) for i, _ in ((1, "a"), (2, "b"), (3, "c")))
 (((i ** 2) + j) for i in (1, 2, 3) for j in (1, 2, 3))
 (*starred)
+{
+    "id": "1",
+    "type": "type",
+    "started_at": now(),
+    "ended_at": now() + timedelta(days=10),
+    "priority": 1,
+    "import_session_id": 1,
+    **kwargs
+}  # no trailing comma, this file is not 3.6+
 a = (1,)
 b = 1,
 c = 1