Commits on Feb 14, 2022

1. Add tests for re-binding …

   Moves re-binding tests from Rakudo into Roast, specifying when
   variables can and cannot be rebound.
   
   Here's a description of the behavior specified by these tests (though,
   of course, the tests themselves are more authoritative than this
   description):
   
    * Non-sigiled 'variables' and other terms cannot be rebound
    * Sigiled variables that weren't declared as part of a Signature can
      be rebound
    * Sigiled variables that were declared as part of a Signature can be
      rebound *only* if declared with `is copy` or `is rw`
   
   For the above "declared as part of a Signature" covers two cases:
    * function declaration: `sub f($a, $b) { }`
    * The signature that is created when a parenthesized expression is
      used as `:=`'s LHS in a variable declaration (see S02, spec'ed in
      S02-names-vars/signature.t): `my ($a, $b) := (42, 47);`

   

   codesections committed Feb 14, 2022
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