commit 7bdaea6e0df849cf3dd7eaaf454eb88f637d1884
author Bram Moolenaar <Bram@vim.org> Sun Apr 19 18:27:26 2020 +0200
committer Bram Moolenaar <Bram@vim.org> Sun Apr 19 18:27:26 2020 +0200
tree fb91b5cbe233e4fe9ab0b52a7851a6f47c5cd84c
parent eb58a2465825c258beafae96240824923f73779f

patch 8.2.0605: Vim9: cannot unlet an environment variable

Problem:    Vim9: cannot unlet an environment variable.
Solution:   Implement unlet for $VAR.

src/testdir/test_vim9_disassemble.vim

diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 7f6d86a..7814952 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -130,6 +130,7 @@
   g:somevar = "value"
   unlet g:somevar
   unlet! g:somevar
+  unlet $SOMEVAR
 enddef
 
 def Test_disassemble_unlet()
@@ -141,7 +142,9 @@
         'unlet g:somevar.*' ..
         '\d UNLET g:somevar.*' ..
         'unlet! g:somevar.*' ..
-        '\d UNLET! g:somevar.*',
+        '\d UNLET! g:somevar.*' ..
+        'unlet $SOMEVAR.*' ..
+        '\d UNLETENV $SOMEVAR.*',
         res)
 enddef
 

src/testdir/test_vim9_script.vim

diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 568338b..4b73399 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -289,6 +289,11 @@
         '  unlet s:svar',
         'enddef',
         ], 'E1081:')
+
+  $ENVVAR = 'foobar'
+  assert_equal('foobar', $ENVVAR)
+  unlet $ENVVAR
+  assert_equal('', $ENVVAR)
 enddef
 
 func Test_wrong_type()