more informative error msg for undeclared field (A(badfield: 1) and a.badfield = expr) (#17777)

tests/errmsgs/tundeclared_field.nim

@@ -0,0 +1,40 @@
+discard """
+cmd: '''nim check --hints:off $file'''
+action: reject
+nimout: '''
+tundeclared_field.nim(25, 12) Error: undeclared field: 'bad' for type tundeclared_field.A [type declared in tundeclared_field.nim(22, 8)]
+tundeclared_field.nim(30, 16) Error: undeclared field: 'bad' for type tundeclared_field.A [type declared in tundeclared_field.nim(28, 8)]
+tundeclared_field.nim(36, 4) Error: undeclared field: 'bad' for type tundeclared_field.A [type declared in tundeclared_field.nim(33, 8)]
+tundeclared_field.nim(40, 13) Error: cannot instantiate Foo [type declared in tundeclared_field.nim(39, 8)]
+'''
+"""
+
+
+
+
+
+
+
+
+
+# line 20
+block:
+  type A = object
+    a0: int
+  var a: A
+  discard a.bad
+
+block:
+  type A = object
+    a0: int
+  var a = A(bad: 0)
+
+block:
+  type A = object
+    a0: int
+  var a: A
+  a.bad = 0
+
+block:
+  type Foo[T: SomeInteger] = object
+  var a: Foo[float]