patch 8.1.1114: confusing overloaded operator "." for string concatenationv8.1.1114

Problem:    Confusing overloaded operator "." for string concatenation.
Solution:   Add ".." for string concatenation.  Also "let a ..= b".

1 files changed, 29 insertions, 0 deletions

diff --git a/src/testdir/test_eval_stuff.vim b/src/testdir/test_eval_stuff.vim
index f4b35983d9..6d61ce9244 100644
--- a/src/testdir/test_eval_stuff.vim
+++ b/src/testdir/test_eval_stuff.vim
@@ -94,3 +94,32 @@ func Test_let_errmsg()
   call assert_fails('let v:errmsg = []', 'E730:')
   let v:errmsg = ''
 endfunc
+
+func Test_string_concatenation()
+  call assert_equal('ab', 'a'.'b')
+  call assert_equal('ab', 'a' .'b')
+  call assert_equal('ab', 'a'. 'b')
+  call assert_equal('ab', 'a' . 'b')
+
+  call assert_equal('ab', 'a'..'b')
+  call assert_equal('ab', 'a' ..'b')
+  call assert_equal('ab', 'a'.. 'b')
+  call assert_equal('ab', 'a' .. 'b')
+
+  let a = 'a'
+  let b = 'b'
+  let a .= b
+  call assert_equal('ab', a)
+
+  let a = 'a'
+  let a.=b
+  call assert_equal('ab', a)
+
+  let a = 'a'
+  let a ..= b
+  call assert_equal('ab', a)
+
+  let a = 'a'
+  let a..=b
+  call assert_equal('ab', a)
+endfunc