Remove redundant use of `Object#to_s` in interpolation.

mrbgems/mruby-bin-debugger/bintest/print.rb

@@ -341,8 +341,8 @@ assert('mruby-bin-debugger(print) Literal:Numeric') do
   tc << {:cmd=>"p +0100",   :exp=>'$3 = 64'}
   tc << {:cmd=>"p 0x100",   :exp=>'$4 = 256'}
   tc << {:cmd=>"p 1_234",   :exp=>'$5 = 1234'}
-  tc << {:cmd=>"p 0b1000_0000", :exp=>"$6 = #{0b1000_0000.to_s}"}
-  tc << {:cmd=>"p 0x1000_0000", :exp=>"$7 = #{0x1000_0000.to_s}"}
+  tc << {:cmd=>"p 0b1000_0000", :exp=>"$6 = #{0b1000_0000}"}
+  tc << {:cmd=>"p 0x1000_0000", :exp=>"$7 = #{0x1000_0000}"}
 
   tc << {:cmd=>"p 3.14",    :exp=>'$8 = 3.14'}
   tc << {:cmd=>"p -12.3",   :exp=>'$9 = -12.3'}

tasks/toolchains/android.rake

@@ -263,7 +263,7 @@ Set ANDROID_PLATFORM environment variable or set :platform parameter
     case toolchain
     when :gcc
     when :clang
-      flags += %W(-gcc-toolchain "#{gcc_toolchain_path.to_s}" -Wno-invalid-command-line-argument -Wno-unused-command-line-argument)
+      flags += %W(-gcc-toolchain "#{gcc_toolchain_path}" -Wno-invalid-command-line-argument -Wno-unused-command-line-argument)
     end
     flags += %W(-fpic -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes)
 

test/t/kernel.rb

@@ -387,7 +387,7 @@ assert('Kernel#method_missing', '15.3.1.3.30') do
   begin
     c.no_method_named_this
   rescue NoMethodError => e
-    assert_equal "undefined method 'no_method_named_this' for #{c.to_s}", e.message
+    assert_equal "undefined method 'no_method_named_this' for #{c}", e.message
   end
 
   class NoInspectClass
@@ -397,7 +397,7 @@ assert('Kernel#method_missing', '15.3.1.3.30') do
   begin
     d.no_method_named_this
   rescue NoMethodError => e
-    assert_equal "undefined method 'no_method_named_this' for #{d.to_s}", e.message
+    assert_equal "undefined method 'no_method_named_this' for #{d}", e.message
   end
 end