patch 8.1.0888: the a: dict is not immutable as documented

Problem:    The a: dict is not immutable as documented.
Solution:   Make the a:dict immutable, add a test. (Ozaki Kiichi, Yasuhiro
            Matsumoto, closes #3929)

diff --git a/src/eval.c b/src/eval.c
index 3f9db7d16ffe69e78b226080dae6e43b5ee2c4e6..08603cad6a87367122c29b1c3f4298785befcb37 100644 (file)
--- a/src/eval.c
+++ b/src/eval.c
@@ -2092,14 +2092,15 @@ get_lval(
 
            if (lp->ll_di == NULL)
            {
-               /* Can't add "v:" variable. */
-               if (lp->ll_dict == &vimvardict)
+               // Can't add "v:" or "a:" variable.
+               if (lp->ll_dict == &vimvardict
+                        || &lp->ll_dict->dv_hashtab == get_funccal_args_ht())
                {
                    semsg(_(e_illvar), name);
                    return NULL;
                }
 
-               /* Key does not exist in dict: may need to add it. */
+               // Key does not exist in dict: may need to add it.
                if (*p == '[' || *p == '.' || unlet)
                {
                    if (!quiet)
@@ -7919,14 +7920,14 @@ set_var(
     }
     else                   /* add a new variable */
     {
-       /* Can't add "v:" variable. */
-       if (ht == &vimvarht)
+       // Can't add "v:" or "a:" variable.
+       if (ht == &vimvarht || ht == get_funccal_args_ht())
        {
            semsg(_(e_illvar), name);
            return;
        }
 
-       /* Make sure the variable name is valid. */
+       // Make sure the variable name is valid.
        if (!valid_varname(varname))
            return;
 

diff --git a/src/testdir/test_let.vim b/src/testdir/test_let.vim
index 24c6ef5e01a1e4ebaa7fd38c379c70cc548d2e40..550655cb6e491fc2d64003533718251cf592f0fa 100644 (file)
--- a/src/testdir/test_let.vim
+++ b/src/testdir/test_let.vim
@@ -25,3 +25,124 @@ func Test_let()
   let s = "\na                     #1\nb                     #2"
   call assert_equal(s, out)
 endfunc
+
+func s:set_arg1(a) abort
+  let a:a = 1
+endfunction
+
+func s:set_arg2(a) abort
+  let a:b = 1
+endfunction
+
+func s:set_arg3(a) abort
+  let b = a:
+  let b['a'] = 1
+endfunction
+
+func s:set_arg4(a) abort
+  let b = a:
+  let b['a'] = 1
+endfunction
+
+func s:set_arg5(a) abort
+  let b = a:
+  let b['a'][0] = 1
+endfunction
+
+func s:set_arg6(a) abort
+  let a:a[0] = 1
+endfunction
+
+func s:set_arg7(a) abort
+  call extend(a:, {'a': 1})
+endfunction
+
+func s:set_arg8(a) abort
+  call extend(a:, {'b': 1})
+endfunction
+
+func s:set_arg9(a) abort
+  let a:['b'] = 1
+endfunction
+
+func s:set_arg10(a) abort
+  let b = a:
+  call extend(b, {'a': 1})
+endfunction
+
+func s:set_arg11(a) abort
+  let b = a:
+  call extend(b, {'b': 1})
+endfunction
+
+func s:set_arg12(a) abort
+  let b = a:
+  let b['b'] = 1
+endfunction
+
+func Test_let_arg_fail()
+  call assert_fails('call s:set_arg1(1)', 'E46:')
+  call assert_fails('call s:set_arg2(1)', 'E461:')
+  call assert_fails('call s:set_arg3(1)', 'E46:')
+  call assert_fails('call s:set_arg4(1)', 'E46:')
+  call assert_fails('call s:set_arg5(1)', 'E46:')
+  call s:set_arg6([0])
+  call assert_fails('call s:set_arg7(1)', 'E742:')
+  call assert_fails('call s:set_arg8(1)', 'E742:')
+  call assert_fails('call s:set_arg9(1)', 'E461:')
+  call assert_fails('call s:set_arg10(1)', 'E742:')
+  call assert_fails('call s:set_arg11(1)', 'E742:')
+  call assert_fails('call s:set_arg12(1)', 'E461:')
+endfunction
+
+func s:set_varg1(...) abort
+  let a:000 = []
+endfunction
+
+func s:set_varg2(...) abort
+  let a:000[0] = 1
+endfunction
+
+func s:set_varg3(...) abort
+  let a:000 += [1]
+endfunction
+
+func s:set_varg4(...) abort
+  call add(a:000, 1)
+endfunction
+
+func s:set_varg5(...) abort
+  let a:000[0][0] = 1
+endfunction
+
+func s:set_varg6(...) abort
+  let b = a:000
+  let b[0] = 1
+endfunction
+
+func s:set_varg7(...) abort
+  let b = a:000
+  let b += [1]
+endfunction
+
+func s:set_varg8(...) abort
+  let b = a:000
+  call add(b, 1)
+endfunction
+
+func s:set_varg9(...) abort
+  let b = a:000
+  let b[0][0] = 1
+endfunction
+
+func Test_let_varg_fail()
+  call assert_fails('call s:set_varg1(1)', 'E46:')
+  call assert_fails('call s:set_varg2(1)', 'E742:')
+  call assert_fails('call s:set_varg3(1)', 'E46:')
+  call assert_fails('call s:set_varg4(1)', 'E742:')
+  call s:set_varg5([0])
+  call assert_fails('call s:set_varg6(1)', 'E742:')
+  " call assert_fails('call s:set_varg7(1)', 'E46:')
+  call assert_fails('call s:set_varg8(1)', 'E742:')
+  call s:set_varg9([0])
+endfunction

diff --git a/src/testdir/test_listdict.vim b/src/testdir/test_listdict.vim
index 1af47d9f7e3e380f908bfa3970b7dc7042e8fa4a..4807d78245aed07988c278411e377d9098c07cfb 100644 (file)
--- a/src/testdir/test_listdict.vim
+++ b/src/testdir/test_listdict.vim
@@ -500,17 +500,21 @@ endfunc
 
 " No remove() of write-protected scope-level variable
 func Tfunc1(this_is_a_long_parameter_name)
-  call assert_fails("call remove(a:, 'this_is_a_long_parameter_name')", 'E795')
+  call assert_fails("call remove(a:, 'this_is_a_long_parameter_name')", 'E742')
 endfunc
 func Test_dict_scope_var_remove()
   call Tfunc1('testval')
 endfunc
 
 " No extend() of write-protected scope-level variable
+func Test_dict_scope_var_extend()
+  call assert_fails("call extend(a:, {'this_is_a_long_parameter_name': 1234})", 'E742')
+endfunc
+
 func Tfunc2(this_is_a_long_parameter_name)
   call assert_fails("call extend(a:, {'this_is_a_long_parameter_name': 1234})", 'E742')
 endfunc
-func Test_dict_scope_var_extend()
+func Test_dict_scope_var_extend_overwrite()
   call Tfunc2('testval')
 endfunc
 
@@ -651,3 +655,75 @@ func Test_listdict_extend()
   call assert_fails("call extend(d, d, 'error')", 'E737:')
   call assert_equal({'a': {'b': 'B'}}, d)
 endfunc
+
+func s:check_scope_dict(x, fixed)
+  func s:gen_cmd(cmd, x)
+    return substitute(a:cmd, '\<x\ze:', a:x, 'g')
+  endfunc
+
+  let cmd = s:gen_cmd('let x:foo = 1', a:x)
+  if a:fixed
+    call assert_fails(cmd, 'E461')
+  else
+    exe cmd
+    exe s:gen_cmd('call assert_equal(1, x:foo)', a:x)
+  endif
+
+  let cmd = s:gen_cmd('let x:["bar"] = 2', a:x)
+  if a:fixed
+    call assert_fails(cmd, 'E461')
+  else
+    exe cmd
+    exe s:gen_cmd('call assert_equal(2, x:bar)', a:x)
+  endif
+
+  let cmd = s:gen_cmd('call extend(x:, {"baz": 3})', a:x)
+  if a:fixed
+    call assert_fails(cmd, 'E742')
+  else
+    exe cmd
+    exe s:gen_cmd('call assert_equal(3, x:baz)', a:x)
+  endif
+
+  if a:fixed
+    if a:x ==# 'a'
+      call assert_fails('unlet a:x', 'E795')
+      call assert_fails('call remove(a:, "x")', 'E742')
+    elseif a:x ==# 'v'
+      call assert_fails('unlet v:count', 'E795')
+      call assert_fails('call remove(v:, "count")', 'E742')
+    endif
+  else
+    exe s:gen_cmd('unlet x:foo', a:x)
+    exe s:gen_cmd('unlet x:bar', a:x)
+    exe s:gen_cmd('call remove(x:, "baz")', a:x)
+  endif
+
+  delfunc s:gen_cmd
+endfunc
+
+func Test_scope_dict()
+  " Test for g:
+  call s:check_scope_dict('g', v:false)
+
+  " Test for s:
+  call s:check_scope_dict('s', v:false)
+
+  " Test for l:
+  call s:check_scope_dict('l', v:false)
+
+  " Test for a:
+  call s:check_scope_dict('a', v:true)
+
+  " Test for b:
+  call s:check_scope_dict('b', v:false)
+
+  " Test for w:
+  call s:check_scope_dict('w', v:false)
+
+  " Test for t:
+  call s:check_scope_dict('t', v:false)
+
+  " Test for v:
+  call s:check_scope_dict('v', v:true)
+endfunc

diff --git a/src/userfunc.c b/src/userfunc.c
index acbab901f068807131278256d98166c9c2bdc368..d1ea33afeb4275ac6996319d1096c8fa371369a6 100644 (file)
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -772,7 +772,7 @@ call_user_func(
        v = &fc->fixvar[fixvar_idx++].var;
        name = v->di_key;
        STRCPY(name, "self");
-       v->di_flags = DI_FLAGS_RO + DI_FLAGS_FIX;
+       v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
        hash_add(&fc->l_vars.dv_hashtab, DI2HIKEY(v));
        v->di_tv.v_type = VAR_DICT;
        v->di_tv.v_lock = 0;
@@ -788,6 +788,7 @@ call_user_func(
     init_var_dict(&fc->l_avars, &fc->l_avars_var, VAR_SCOPE);
     add_nr_var(&fc->l_avars, &fc->fixvar[fixvar_idx++].var, "0",
                                (varnumber_T)(argcount - fp->uf_args.ga_len));
+    fc->l_avars.dv_lock = VAR_FIXED;
     /* Use "name" to avoid a warning from some compiler that checks the
      * destination size. */
     v = &fc->fixvar[fixvar_idx++].var;

diff --git a/src/version.c b/src/version.c
index 94825f826d5d3ebf7ee308ba500a025c4f049097..e31b7cace66afe93b2a1a9e4c53c75f659b342da 100644 (file)
--- a/src/version.c
+++ b/src/version.c
@@ -783,6 +783,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    888,
 /**/
     887,
 /**/