`val from_string : string ‑> t`

Create a java field name from string

`val is_captured_parameter : t ‑> bool`

Check if field is a captured parameter

`val get_class : t ‑> string`

The class part of the fieldname

`val get_field : t ‑> string`

The last component of the fieldname

`val is_outer_instance : t ‑> bool`

Check if the field is the synthetic this$n of a nested class, used to access the n-th outer instance.