[Python] Add syntax highlighting for type comments

Python/Python.sublime-syntax

@@ -402,6 +402,26 @@ contexts:
       pop: true
 
   comments:
+    - match: '(#)\s*(type)(:)'
+      captures:
+        1: punctuation.definition.comment.python comment.line.number-sign.python
+        2: keyword.other.annotation.typecomment
+        3: punctuation.separator.annotation.comment
+      push:
+        - match: 'ignore'
+          scope: keyword.other.annotation.typecomment.ignore
+          set:
+            - include: comments_noannotation
+            - match: \n
+              pop: true
+        - include: comments_noannotation
+        - include: expressions
+        - match: \n
+          pop: true
+
+    - include: comments_noannotation
+
+  comments_noannotation:
     - match: "#"
       scope: punctuation.definition.comment.python
       push:

Python/syntax_test_python.py

@@ -1350,6 +1350,21 @@ class Starship:
 #        ^ punctuation.separator.annotation.variable.python
 #                                   ^ keyword.operator.assignment
 
+primes = 5  # type: ignore # type: ignore
+#           ^ punctuation.definition.comment.python
+#             ^^^^ keyword.other.annotation.typecomment
+#                 ^ punctuation.separator.annotation.comment
+#                   ^^^^^^^ keyword.other.annotation.typecomment.ignore
+#                          ^ comment.line.number-sign.python punctuation.definition.comment.python
+#                            ^^^^^^^^^^^^^ comment.line.number-sign.python - keyword
+
+primes = 5  # type: List[int] # comment
+#           ^ punctuation.definition.comment.python
+#             ^^^^ comment.line.number-sign.python keyword.other.annotation.typecomment
+#                 ^ comment.line.number-sign.python punctuation.separator.annotation.typecomment
+#                          ^ comment.line.number-sign.python punctuation.definition.comment.python
+#                             ^^^^^^^^^^^ comment.line.number-sign.python
+
 
 # <- - meta
 # ensure we're not leaking a context