If an argument error refers to a variadic argument, we normally
do not print the name of the variadic (as it is not referring to
an individual argument, but to the collection of all of them).
However, this was not the case for the userland argument type
error message, which did it's own formatting.
Closes GH-6101.
This helps to avoid unnecessary IS_REFERENCE checks.
This changes some notices "Only variables should be passed by reference" to exception "Cannot pass parameter %d by reference".
Also, for consistency, compile-time fatal error "Only variables can be passed by reference" was converted to exception "Cannot pass parameter %d by reference"
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.
Closes GH-5059.
PHP requires integer typehints to be written "int" and does not
allow "integer" as an alias. This changes type error messages to
match the actual type name and avoids confusing messages like
"must be of the type integer, integer given".
We currently don't show the argument at which the error actually
occured in the trace - should probably either add it or don't
display args on incomplete frames altogether, otherwise this'll
probably be confusing.
