Incorrectly parsed ternary_expression

[ketkarameya]

I observed that if a ternary expression is like - false ? "foo" : nil (note the nil), the if_false field does not get populated.

However it works if the the alternative was an expression other than nil ... false ? "foo" : "y" parses ok.

I wonder why nil is not parsed as an expression here - https://github.com/alex-pinkus/tree-sitter-swift/blob/main/grammar.js#L795

[ketkarameya]

also observed that

• if_true field is not populated if the ternary was something like false? nil : x
• both if_false and if_false are not populated when false ? nil: nil

After tinkering for sometime, i observed that "nil" is the only value for which i observe such a behavior.

Tried to update to _expr_hack_at_ternary_binary_suffix to :

_expr_hack_at_ternary_binary_suffix: ($) =>
      prec.left(
        PRECS.ternary_binary_suffix,
        choice(
          "nil",
          $._expression,
          alias($.expr_hack_at_ternary_binary_call, $.call_expression)
        )
      )

Didnt work :|