check_dots_unnamed: Check that all dots are unnamed
Description
In functions like paste(), named arguments in ... are often a
sign of misspelled argument names. Call check_dots_unnamed() to
fail with an error when named arguments are detected.
An optional error handler passed to try_fetch(). Use
this e.g. to demote an error into a warning.
call
The execution environment of a currently
running function, e.g. caller_env(). The function will be
mentioned in error messages as the source of the error. See the
call argument of abort() for more information.