patch 8.2.1794: no falsy Coalescing operatorv8.2.1794

Problem:    No falsy Coalescing operator.
Solution:   Add the "??" operator.  Fix mistake with function argument count.

1 files changed, 22 insertions, 0 deletions

diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index cfae760d49..1086534dca 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -42,6 +42,28 @@ func Test_version()
   call assert_false(has('patch-9.9.1'))
 endfunc
 
+func Test_op_falsy()
+  call assert_equal(v:true, v:true ?? 456)
+  call assert_equal(123, 123 ?? 456)
+  call assert_equal('yes', 'yes' ?? 456)
+  call assert_equal(0z00, 0z00 ?? 456)
+  call assert_equal([1], [1] ?? 456)
+  call assert_equal(#{one: 1}, #{one: 1} ?? 456)
+  if has('float')
+    call assert_equal(0.1, 0.1 ?? 456)
+  endif
+
+  call assert_equal(456, v:false ?? 456)
+  call assert_equal(456, 0 ?? 456)
+  call assert_equal(456, '' ?? 456)
+  call assert_equal(456, 0z ?? 456)
+  call assert_equal(456, [] ?? 456)
+  call assert_equal(456, {} ?? 456)
+  if has('float')
+    call assert_equal(456, 0.0 ?? 456)
+  endif
+endfunc
+
 func Test_dict()
   let d = {'': 'empty', 'a': 'a', 0: 'zero'}
   call assert_equal('empty', d[''])