merge revision(s) 2bc293e899c9d32dcd794a73de8925c49ecf8f15,d0e6c6e682b9ba2b0309a5177933a0628e8ef316,cc0dc67bbbe1951ff90004bc987f78545625d772,e1eff837cf12a8e813de9d4ff2db50c9b68b86b5,0ab0b86c8491d639b9ff1335ddf35e341ecd867e,6911b4bc82889860ff7da4ecf975504cdc3e5314: [Backport #17854]

	cdhash_cmp: can take rational literals

	Rational literals are those integers suffixed with `r`.  They tend to
	be a part of more complex expressions like `123/456r`, but in theory
	they can live alone.  When such "bare" rational literals are passed to
	case-when branch, we have to take care of them.  Fixes [Bug #17854]
	---
	 common.mk                  |  1 +
	 compile.c                  |  7 +++++++
	 internal/rational.h        |  1 +
	 rational.c                 | 13 ++++++++++---
	 test/ruby/test_rational.rb |  7 +++++++
	 5 files changed, 26 insertions(+), 3 deletions(-)

	cdhash_cmp: rational literals with fractions

	Nobu kindly pointed out that rational literals can have fractions.
	---
	 compile.c                  | 5 +++--
	 test/ruby/test_rational.rb | 4 ++++
	 2 files changed, 7 insertions(+), 2 deletions(-)

	cdhash_cmp: can also take complex

	There are complex literals `123i`, which can also be a case condition.
	---
	 compile.c                  | 15 +++++++++++----
	 complex.c                  | 12 +++++++++---
	 internal/complex.h         |  1 +
	 test/ruby/test_rational.rb |  4 ++++
	 4 files changed, 25 insertions(+), 7 deletions(-)

	cdhash_cmp: recursively apply

	For instance a rational's numerator can be a bignum.  Comparison using
	C's == can be insufficient.
	---
	 compile.c | 4 ++--
	 1 file changed, 2 insertions(+), 2 deletions(-)

	cdhash_cmp: should use ||

	cf: https://github.com/ruby/ruby/pull/4469#discussion_r628386707
	---
	 compile.c | 4 ++--
	 1 file changed, 2 insertions(+), 2 deletions(-)

	test_cdhash: refactor change class

	It is now strange to test Complex in a class named Rational_Test.
	---
	 test/ruby/test_rational.rb | 15 ---------------
	 test/ruby/test_syntax.rb   | 15 +++++++++++++++
	 2 files changed, 15 insertions(+), 15 deletions(-)

2 files changed, 2 insertions, 0 deletions

diff --git a/internal/complex.h b/internal/complex.h
index 6f63a9ebeb..9eae804ddb 100644
--- a/internal/complex.h
+++ b/internal/complex.h
@@ -25,5 +25,6 @@ struct RComplex {
 
 /* complex.c */
 VALUE rb_dbl_complex_new_polar_pi(double abs, double ang);
+st_index_t rb_complex_hash(VALUE comp);
 
 #endif /* INTERNAL_COMPLEX_H */
diff --git a/internal/rational.h b/internal/rational.h
index e53ee7b499..6bbd2a9810 100644
--- a/internal/rational.h
+++ b/internal/rational.h
@@ -33,6 +33,7 @@ VALUE rb_rational_div(VALUE self, VALUE other);
 VALUE rb_lcm(VALUE x, VALUE y);
 VALUE rb_rational_reciprocal(VALUE x);
 VALUE rb_cstr_to_rat(const char *, int);
+VALUE rb_rational_hash(VALUE self);
 VALUE rb_rational_abs(VALUE self);
 VALUE rb_rational_cmp(VALUE self, VALUE other);
 VALUE rb_rational_pow(VALUE self, VALUE other);