patch 9.0.2027: Vim9: no support for bitwise operators in lambda funcs

Problem:  Vim9: no support for bitwise operators in lambda funcs
Solution: move "evaluate" assignment a bit up in order to decide
          to perform bitwise operations

closes: #13342
closes: #13345

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

src/testdir/test_expr.vim

@@ -1041,6 +1041,50 @@ func Test_bitwise_shift()
      assert_equal(16, a)
   END
   call v9.CheckDefAndScriptSuccess(lines)
+
+  let lines =<< trim END
+    # Use in a lambda function
+    const DivBy2Ref_A = (n: number): number => n >> 1
+    assert_equal(16, DivBy2Ref_A(32))
+    const DivBy2Ref_B = (n: number): number => (<number>n) >> 1
+    assert_equal(16, DivBy2Ref_B(32))
+    const MultBy2Ref_A = (n: number): number => n << 1
+    assert_equal(8, MultBy2Ref_A(4))
+    const MultBy2Ref_B = (n: number): number => (<number>n) << 1
+    assert_equal(8, MultBy2Ref_B(4))
+
+    def DivBy2_A(): func(number): number
+      return (n: number): number => n >> 1
+    enddef
+    assert_equal(16, DivBy2_A()(32))
+    def DivBy2_B(): func(number): number
+      return (n: number): number => (<number>n) >> 1
+    enddef
+    assert_equal(16, DivBy2_B()(32))
+    def MultBy2_A(): func(number): number
+      return (n: number): number => n << 1
+    enddef
+    assert_equal(64, MultBy2_A()(32))
+    def MultBy2_B(): func(number): number
+      return (n: number): number => (<number>n) << 1
+    enddef
+    assert_equal(64, MultBy2_B()(32))
+  END
+  call v9.CheckDefAndScriptSuccess(lines)
+
+  " Use in a legacy lambda function
+  const DivBy2Ref_A = {n -> n >> 1}
+  call assert_equal(16, DivBy2Ref_A(32))
+  func DivBy2_A()
+    return {n -> n >> 1}
+  endfunc
+  call assert_equal(16, DivBy2_A()(32))
+  const MultBy2Ref_A = {n -> n << 1}
+  call assert_equal(64, MultBy2Ref_A(32))
+  func MultBy2_A()
+    return {n -> n << 1}
+  endfunc
+  call assert_equal(64, MultBy2_A()(32))
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab