From 6227f8a576ac5a27245aecc8e70cb2b8b1a4b0a0 Mon Sep 17 00:00:00 2001
From: Sampo Kuokkanen <sampo.kuokkanen@gmail.com>
Date: Mon, 11 May 2026 21:19:19 +0900
Subject: [PATCH] Add specs for case/when with out-of-int-range Integer
 literals

Add specs covering case/when with Integer literals outside
32-bit int range (10_000_000_000, -3_000_000_000) and beyond 64-bit
long range (1 << 100).

Existing case/when specs only exercised small Integers, so optimized
implementations whose codepaths diverge at the int/long boundary were
not covered.
---
 language/case_spec.rb | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/language/case_spec.rb b/language/case_spec.rb
index 8355062e4..41881bf20 100644
--- a/language/case_spec.rb
+++ b/language/case_spec.rb
@@ -27,6 +27,41 @@ def bar; @calls << :bar; end
     @calls.should == [:foo, :bar]
   end
 
+  it "matches an Integer literal whose value does not fit in a 32-bit int" do
+    big = 10_000_000_000
+    case big
+    when 10_000_000_000; true
+    else                 false
+    end.should == true
+
+    case -3_000_000_000
+    when -3_000_000_000; true
+    else                 false
+    end.should == true
+  end
+
+  it "matches an arbitrary-precision Integer literal" do
+    huge = 1267650600228229401496703205376
+    case huge
+    when 1267650600228229401496703205376; true
+    else                                  false
+    end.should == true
+  end
+
+  it "dispatches correctly with mixed small and large Integer literals" do
+    pick = -> x {
+      case x
+      when 1267650600228229401496703205376 then :beyond_long
+      when 10_000_000_000                  then :beyond_int
+      when 1                               then :fits_int
+      else                                      :other
+      end
+    }
+
+    [1267650600228229401496703205376, 10_000_000_000, 1, :nope].map(&pick).should ==
+      [:beyond_long, :beyond_int, :fits_int, :other]
+  end
+
   it "evaluates the body of the when clause whose range expression includes the case target expression" do
     case 5
     when 21..30; false