patch 8.0.0119
Problem:    No test for using CTRL-R on the command line.
Solution:   Add a test. (Dominique Pelle) And some more.
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 3718087..3080971 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -194,3 +194,26 @@
   bwipe!
   call delete('a', 'rf')
 endfunc
+
+func Test_paste_in_cmdline()
+  let @a = "def"
+  call feedkeys(":abc \<C-R>a ghi\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"abc def ghi', @:)
+
+  new
+  call setline(1, 'asdf.x /tmp/some verylongword a;b-c*d ')
+
+  call feedkeys(":aaa \<C-R>\<C-W> bbb\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"aaa asdf bbb', @:)
+
+  call feedkeys("ft:aaa \<C-R>\<C-F> bbb\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"aaa /tmp/some bbb', @:)
+
+  set incsearch
+  call feedkeys("fy:aaa veryl\<C-R>\<C-W> bbb\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"aaa verylongword bbb', @:)
+
+  call feedkeys("f;:aaa \<C-R>\<C-A> bbb\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"aaa a;b-c*d bbb', @:)
+  bwipe!
+endfunc