Fix highlighting dotted names in type annotations.

syntax/python.vim

 syn match   pythonIdentifier    "\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" nextgroup=pythonFuncArgs,pythonTypeAnno display
 syn keyword pythonException     try except finally
 syn keyword pythonOperator      and in is not or
-syn match pythonLambdaExpr   "\<lambda[^:]*:"he=s+6 display contains=@pythonExpression nextgroup=@pythonExpression
+syn match pythonLambdaExpr   "\<lambda[^:]*:"he=s+6 contains=@pythonExpression nextgroup=@pythonExpression
 
 syn region pythonDictSetExpr matchgroup=pythonDictSetExpr start='{' end='}' contains=@pythonExpression
 syn region pythonListSliceExpr matchgroup=pythonListSliceExpr start='\[' end='\]' contains=@pythonExpression
 
 if !s:Python2Syntax()
   if s:Enabled("g:python_highlight_type_annotations")
-    syn match pythonTypeAnno @:\s*['"]\?\([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\([^[:cntrl:][:punct:][:space:]]\|_\)*['"]\?@hs=s+1 display contained contains=pythonType,pythonString nextgroup=pythonTypeArgs
-    syn match pythonTypeAnnoReturn @->\s*['"]\?\([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\([^[:cntrl:][:punct:][:space:]]\|_\)*['"]\?@ display contains=pythonType,pythonString nextgroup=pythonTypeArgs
+    syn match pythonTypeAnno @:\s*['"]\?\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\%(\.\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\)*['"]\?@hs=s+1 display contained contains=pythonType,pythonString nextgroup=pythonTypeArgs
+    syn match pythonTypeAnnoReturn @->\s*['"]\?\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\%(\.\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\)*['"]\?@ display contains=pythonType,pythonString nextgroup=pythonTypeArgs
     syn region pythonTypeArgs matchgroup=pythonTypeArgs start='\[' end='\]' display contained contains=pythonType,pythonString,pythonTypeArgs
     syn keyword pythonType Any AnyStr Callable ClassVar Tuple Union Optional Type TypeVar None contained
     syn keyword pythonType AbstractSet MutableSet Mapping MutableMapping Sequence MutableSequence ByteString Deque List contained

test.py

 # Type annotations
 
 def myfunc(a: str, something_other,
-           b: Callable[[str, str], int]) -> 'runtime_resolved_type':
+           b: Callable[[str, str], int],
+           c: mypkg.MyType) -> 'runtime_resolved_type':
     myval: float
     mygood: Optional[int, Any] = b('wow', 'oops')
     myarr: Sequence[int] = origarr[aa:bb] + (lambda: x)()