Deprecate passing arguments to Set#to_set and Enumerable#to_set

Array#to_a, Hash#to_h, Enumerable#to_a, and Enumerable#to_h do not
allow you to specify subclasses.  This has undesired behavior when
passing non-Set subclasses.  All of these are currently allowed, and
none make sense:

```ruby
enum = [1,2,3].to_enum

enum.to_set(Hash)
enum.to_set(Struct.new("A", :a))
enum.to_set(ArgumentError)
enum.to_set(Thread){}
```

Users who want to create instances of a subclass of Set from an
enumerable should pass the enumerable to SetSubclass.new instead of
using to_set.

1 files changed, 2 insertions, 0 deletions

diff --git a/common.mk b/common.mk
index ad5ebac281..748e622beb 100644
--- a/common.mk
+++ b/common.mk
@@ -16792,6 +16792,7 @@ set.$(OBJEXT): $(top_srcdir)/internal/array.h
 set.$(OBJEXT): $(top_srcdir)/internal/basic_operators.h
 set.$(OBJEXT): $(top_srcdir)/internal/bits.h
 set.$(OBJEXT): $(top_srcdir)/internal/compilers.h
+set.$(OBJEXT): $(top_srcdir)/internal/error.h
 set.$(OBJEXT): $(top_srcdir)/internal/gc.h
 set.$(OBJEXT): $(top_srcdir)/internal/hash.h
 set.$(OBJEXT): $(top_srcdir)/internal/imemo.h
@@ -16801,6 +16802,7 @@ set.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 set.$(OBJEXT): $(top_srcdir)/internal/serial.h
 set.$(OBJEXT): $(top_srcdir)/internal/set_table.h
 set.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
+set.$(OBJEXT): $(top_srcdir)/internal/string.h
 set.$(OBJEXT): $(top_srcdir)/internal/symbol.h
 set.$(OBJEXT): $(top_srcdir)/internal/variable.h
 set.$(OBJEXT): $(top_srcdir)/internal/vm.h