"errmsg":"d2/testdata/d2compiler/TestCompile/grid_nested.d2:2:2: invalid grid diagram \"hey\". can only set \"rows\" with no descendants (see \"hey.d.invalid descendant\")"
"errmsg":"d2/testdata/d2compiler/TestCompile/grid_nested.d2:3:2: invalid grid diagram \"hey\". can only set \"columns\" with no descendants (see \"hey.d.invalid descendant\")"