vim-patch:8.1.1765: get(func, dict, def) does not work properly

Problem:    get(func, dict, def) does not work properly.
Solution:   Handle NULL dict better. (Takuya Fujiwara, closes vim/vim#4734)
f91aac5e3e

src/nvim/eval.c

@@ -9600,6 +9600,7 @@ static void f_get(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   dictitem_T  *di;
   dict_T      *d;
   typval_T    *tv = NULL;
+  bool what_is_dict = false;
 
   if (argvars[0].v_type == VAR_LIST) {
     if ((l = argvars[0].vval.v_list) != NULL) {
@@ -9641,7 +9642,10 @@ static void f_get(typval_T *argvars, typval_T *rettv, FunPtr fptr)
           func_ref(rettv->vval.v_string);
         }
       } else if (strcmp(what, "dict") == 0) {
-        tv_dict_set_ret(rettv, pt->pt_dict);
+        what_is_dict = true;
+        if (pt->pt_dict != NULL) {
+          tv_dict_set_ret(rettv, pt->pt_dict);
+        }
       } else if (strcmp(what, "args") == 0) {
         rettv->v_type = VAR_LIST;
         if (tv_list_alloc_ret(rettv, pt->pt_argc) != NULL) {
@@ -9652,7 +9656,12 @@ static void f_get(typval_T *argvars, typval_T *rettv, FunPtr fptr)
       } else {
         EMSG2(_(e_invarg2), what);
       }
-      return;
+
+      // When {what} == "dict" and pt->pt_dict == NULL, evaluate the
+      // third argument
+      if (!what_is_dict) {
+        return;
+      }
     }
   } else {
     EMSG2(_(e_listdictarg), "get()");

src/nvim/testdir/test_getvar.vim

@@ -1,4 +1,5 @@
-" Tests for getwinvar(), gettabvar() and gettabwinvar().
+" Tests for getwinvar(), gettabvar(), gettabwinvar() and get().
+
 func Test_var()
   " Use strings to test for memory leaks.  First, check that in an empty
   " window, gettabvar() returns the correct value
@@ -102,3 +103,44 @@ func Test_gettabvar_in_tabline()
   close
   redrawstatus!
 endfunc
+
+" Test get() function using default value.
+
+" get({dict}, {key} [, {default}])
+func Test_get_dict()
+  let d = {'foo': 42}
+  call assert_equal(42, get(d, 'foo', 99))
+  call assert_equal(999, get(d, 'bar', 999))
+endfunc
+
+" get({list}, {idx} [, {default}])
+func Test_get_list()
+  let l = [1,2,3]
+  call assert_equal(1, get(l, 0, 999))
+  call assert_equal(3, get(l, -1, 999))
+  call assert_equal(999, get(l, 3, 999))
+endfunc
+
+" get({blob}, {idx} [, {default}]) - in test_blob.vim
+
+" get({lambda}, {what} [, {default}])
+func Test_get_lambda()
+  let l:L = {-> 42}
+  call assert_match('^<lambda>', get(l:L, 'name'))
+  call assert_equal(l:L, get(l:L, 'func'))
+  call assert_equal({'lambda has': 'no dict'}, get(l:L, 'dict', {'lambda has': 'no dict'}))
+  call assert_equal(0, get(l:L, 'dict'))
+  call assert_equal([], get(l:L, 'args'))
+endfunc
+
+" get({func}, {what} [, {default}])
+func Test_get_func()
+  let l:F = function('tr')
+  call assert_equal('tr', get(l:F, 'name'))
+  call assert_equal(l:F, get(l:F, 'func'))
+  call assert_equal({'func has': 'no dict'}, get(l:F, 'dict', {'func has': 'no dict'}))
+  call assert_equal(0, get(l:F, 'dict'))
+  call assert_equal([], get(l:F, 'args'))
+endfunc
+
+" get({partial}, {what} [, {default}]) - in test_partial.vim

src/nvim/testdir/test_partial.vim

@@ -285,6 +285,11 @@ func Test_get_partial_items()
   call assert_equal('MyDictFunc', get(Func, 'name'))
   call assert_equal([], get(Func, 'args'))
   call assert_true(empty( get(Func, 'dict')))
+
+  let P = function('substitute', ['hello there', 'there'])
+  let dict = {'partial has': 'no dict'}
+  call assert_equal(dict, get(P, 'dict', dict))
+  call assert_equal(0, get(l:P, 'dict'))
 endfunc
 
 func Test_compare_partials()