Visit regular imports.

def visit_Import(self, node, frame):
        """Visit regular imports."""
        self.writeline('%s = ' % frame.symbols.ref(node.target), node)
        if frame.toplevel:
            self.write('context.vars[%r] = ' % node.target)
        if self.environment.is_async:
            self.write('await ')
        self.write('environment.get_template(')
        self.visit(node.template, frame)
        self.write(', %r).' % self.name)
        if node.with_context:
            self.write('make_module%s(context.get_all(), True, %s)'
                       % (self.environment.is_async and '_async' or '',
                          self.dump_local_context(frame)))
        elif self.environment.is_async:
            self.write('_get_default_module_async()')
        else:
            self.write('_get_default_module()')
        if frame.toplevel and not node.target.startswith('_'):
            self.writeline('context.exported_vars.discard(%r)' % node.target)