From c34821864e448d8791f805623e0f4690258579be Mon Sep 17 00:00:00 2001
From: "michael.metivier" <michael.metivier@gentex.com>
Date: Fri, 2 Nov 2018 00:03:54 -0400
Subject: [PATCH] Allow construction variable expansion on _true_ and _false_
 literals

---
 lib/rscons/varset.rb       | 8 ++++++--
 spec/rscons/varset_spec.rb | 6 ++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/rscons/varset.rb b/lib/rscons/varset.rb
index 95ababd..2135c7a 100644
--- a/lib/rscons/varset.rb
+++ b/lib/rscons/varset.rb
@@ -86,12 +86,12 @@ module Rscons
     # Replace "$!{var}" variable references in varref with the expanded
     # variables' values, recursively.
     #
-    # @param varref [nil, String, Array, Proc]
+    # @param varref [nil, String, Array, Proc, Symbol, TrueClass, FalseClass]
     #   Value containing references to variables.
     # @param lambda_args [Array]
     #   Arguments to pass to any lambda variable values to be expanded.
     #
-    # @return [nil, String, Array]
+    # @return [nil, String, Array, Symbol, TrueClass, FalseClass]
     #   Expanded value with "$!{var}" variable references replaced.
     def expand_varref(varref, lambda_args)
       if varref.is_a?(String)
@@ -118,6 +118,10 @@ module Rscons
         nil
       elsif varref.is_a?(Symbol)
         varref
+      elsif varref.is_a?(TrueClass)
+        varref
+      elsif varref.is_a?(FalseClass)
+        varref
       else
         raise "Unknown varref type: #{varref.class} (#{varref.inspect})"
       end
diff --git a/spec/rscons/varset_spec.rb b/spec/rscons/varset_spec.rb
index 4e0d479..5d8bee5 100644
--- a/spec/rscons/varset_spec.rb
+++ b/spec/rscons/varset_spec.rb
@@ -159,6 +159,12 @@ module Rscons
       it "calls a lambda with the given lambda arguments" do
         expect(v.expand_varref("${lambda}", [v: "fez"])).to eq("fez--12")
       end
+      it "returns true when passed true" do
+        expect(v.expand_varref(true, :lambda_args)).to eq(true)
+      end
+      it "returns false when passed false" do
+        expect(v.expand_varref(false, :lambda_args)).to eq(false)
+      end
       it "raises an error when given an invalid argument" do
         expect { v.expand_varref({a: :b}, :lambda_args) }.to raise_error /Unknown varref type: Hash/
       end