patch 8.2.2228: Vim9: cannot use ":e #" because # starts a comment
Problem: Vim9: cannot use ":e #" because # starts a comment.
Solution: Support using %% instead of #.
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index f5619b4..b6644e3 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -25,6 +25,53 @@
CheckDefFailure(['edit `="foo"'], 'E1083:')
enddef
+def Test_expand_alternate_file()
+ var lines =<< trim END
+ edit Xfileone
+ var bone = bufnr()
+ edit Xfiletwo
+ var btwo = bufnr()
+ edit Xfilethree
+ var bthree = bufnr()
+
+ edit #
+ assert_equal(bthree, bufnr())
+ edit %%
+ assert_equal(btwo, bufnr())
+ edit %% # comment
+ assert_equal(bthree, bufnr())
+ edit %%yy
+ assert_equal('Xfiletwoyy', bufname())
+
+ exe "edit %%" .. bone
+ assert_equal(bone, bufnr())
+ exe "edit %%" .. btwo .. "xx"
+ assert_equal('Xfiletwoxx', bufname())
+
+ next Xfileone Xfiletwo Xfilethree
+ assert_equal('Xfileone', argv(0))
+ assert_equal('Xfiletwo', argv(1))
+ assert_equal('Xfilethree', argv(2))
+ next %%%zz
+ assert_equal('Xfileone', argv(0))
+ assert_equal('Xfiletwo', argv(1))
+ assert_equal('Xfilethreezz', argv(2))
+
+ v:oldfiles = ['Xonefile', 'Xtwofile']
+ edit %%<1
+ assert_equal('Xonefile', bufname())
+ edit %%<2
+ assert_equal('Xtwofile', bufname())
+ assert_fails('edit %%<3', 'E684:')
+
+ edit Xfileone.vim
+ edit Xfiletwo
+ edit %%:r
+ assert_equal('Xfileone', bufname())
+ END
+ CheckDefAndScriptSuccess(lines)
+enddef
+
def Test_global_backtick_expansion()
new
setline(1, 'xx')