Remove redundant lhs analysis.

Cython/Compiler/Nodes.py

@@ -4753,8 +4753,6 @@ class SingleAssignmentNode(AssignmentNode):
         from . import ExprNodes, UtilNodes
 
         self.rhs = self.rhs.analyse_types(env)
-        self.lhs = self.lhs.analyse_target_types(env)
-        self.lhs.gil_assignment_check(env)
 
         if self.rhs.type.is_ctuple and isinstance(self.lhs, ExprNodes.TupleNode):
             if self.rhs.type.size == len(self.lhs.args):
@@ -4774,6 +4772,9 @@ class SingleAssignmentNode(AssignmentNode):
                 error(self.pos, "Unpacking type %s requires exactly %s arguments." % (
                                     self.rhs.type, self.rhs.type.size))
 
+        self.lhs = self.lhs.analyse_target_types(env)
+        self.lhs.gil_assignment_check(env)
+
         if self.lhs.memslice_broadcast or self.rhs.memslice_broadcast:
             self.lhs.memslice_broadcast = True
             self.rhs.memslice_broadcast = True

tests/run/ctuple.pyx

@@ -52,10 +52,12 @@ def c_types(int a, double b):
     >>> c_types(1, 2)
     (1, 2.0)
     """
+    cdef int* a_ptr
+    cdef double* b_ptr
     cdef (int*, double*) ab
     ab[0] = &a
     ab[1] = &b
-    a_ptr, b_ptr = ab[0], ab[1]
+    a_ptr, b_ptr = ab
     return a_ptr[0], b_ptr[0]
 
 cpdef (int, double) ctuple_return_type(x, y):