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rajatnagda45
b52c330ee6
A bodyless `def area: Double` parses as `function_declaration`; a `def` WITH a
body is `function_definition`. Only the latter was a Scala function type, so
every deferred (abstract) method was dropped.
In Scala that is the common case, not an edge case: a `trait` used as an
interface is entirely deferred defs, so the whole contract vanished — the trait
had no method nodes, and a concrete method calling a deferred one
(`describe` -> `name()`) had no target to link to. The same held for an
`abstract class`'s abstract members.
Fix: add `function_declaration` to the Scala function types. A bodyless `def`
only occurs inside a `trait`/`abstract class` body, so it is always a method
declaration; its name sits on the same `name` field as `function_definition`.
Added tests/test_scala_abstract_methods.py: deferred methods (with and without
a parameter list) become nodes in both a trait and an abstract class, a pure
interface trait keeps every contract method, and a call to a deferred method
now resolves.
(cherry picked from commit 7c82507b5e)