Allow variadic arguments to replace non-variadic ones #5059
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Any number of arguments can be replaced by a variadic one, so long as the variadic argument is compatible (in the sense of contravariance) with the subsumed arguments. In particular this means that function(...$args) becomes a near-universal signature: It is compatible with any function signature that does not accept parameters by-reference. This also fixes bug #70839, which describes a special case.
Kubo2
reviewed
Jan 7, 2020
| continue; | ||
| } | ||
| if (!fe_arg_info) { | ||
| /* An argument has been removed. This is considered illegal, because arity checks |
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In this case, it's indeed arity.
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Any number of arguments can be replaced by a variadic one, so
long as the variadic argument is compatible (in the sense of
contravariance) with the subsumed arguments.
In particular this means that function(...$args) becomes a
near-universal signature: It is compatible with any function
signature that does not accept parameters by-reference.
This also fixes bug #70839, which describes a special case.