Revert "Add ability to refer to subfields of objects via dot notation in string formatting (#1011)" (#1099)

This reverts commit 1cefde7.

Author: sparkprime

stdlib/std.jsonnet

@@ -770,24 +770,11 @@ limitations under the License.
               error 'Cannot use * precision with object.'
             else
               code.prec;
-          local get_nested_val(obj, f, start=0, end=0) =
-            if !std.isObject(obj) then
-              error 'Subfield ' + f[:start] + ' didn\'t yield an object.'
-            else if end >= std.length(f) then
-              if std.objectHasAll(obj, f[start:]) then
-                obj[f[start:]]
-              else
-                error 'No such field: ' + f
-            else if f[end] == "." then
-              local key = f[start:end];
-              if std.objectHasAll(obj, key) then
-                get_nested_val(obj[key], f, end+1, end+1) tailstrict
-              else
-                error 'No such partial field: ' + f[:end]
+          local val =
+            if std.objectHasAll(obj, f) then
+              obj[f]
             else
-              get_nested_val(obj, f, start, end+1) tailstrict
-          ;
-          local val = get_nested_val(obj, f);
+              error 'No such field: ' + f;
           local s =
             if code.ctype == '%' then
               '%'

test_suite/error.format.invalid_object_subfield.jsonnet

@@ -312,6 +312,5 @@ local text = |||
 
 std.assertEqual(std.length(text), 1244) &&
 
-std.assertEqual(std.format('%(a.b.c.d)s %(b.c)s', {a:{b:{c:{d:'hello'}}}, b:{c:'goodbye'}}), 'hello goodbye') &&
 
 true