error: field 'q' not found on type 'Point'
  --> examples/1145-diagnostics-missing-struct-field-assign.sx:18:5
   |
18 |     p.q = 2;                              // site 1: lowerAssignment target path
   |     ^^^

error: field 'missing' not found on type 'Outer'
  --> examples/1145-diagnostics-missing-struct-field-assign.sx:21:5
   |
21 |     o.missing.a = 5;                      // site 2: lowerExprAsPtr fallback
   |     ^^^^^^^^^