Just another update

Task/Enforced-immutability/00DESCRIPTION

@@ -1,2 +1 @@
 Demonstrate any means your language has to prevent the modification of values, or to create objects that cannot be modified after they have been created.
-{{omit from|MUMPS}} <!-- All variables can be altered. -->

Task/Enforced-immutability/00META.yaml

@@ -0,0 +1,4 @@
+---
+category:
+- Initialization
+note: Enforced immutability

Task/Enforced-immutability/Fortran/enforced-immutability-1.f

@@ -0,0 +1 @@
+real, parameter :: pi = 3.141593

Task/Enforced-immutability/Fortran/enforced-immutability-2.f

@@ -0,0 +1,2 @@
+subroutine sub1(n)
+  real, intent(in) :: n

Task/Enforced-immutability/PL-I/enforced-immutability.pli

@@ -0,0 +1,6 @@
+*process source attributes xref;
+ constants: Proc Options(main);
+ Dcl three Bin Fixed(15) Value(3);
+ Put Skip List(1/three);
+ Put Skip List(1/3);
+ End;

Task/Enforced-immutability/Perl-6/enforced-immutability-3.pl6

@@ -1,2 +1 @@
-my $pi is readonly = 3 + rand;
-my $pi ::= 3 + rand; # same thing, SSA-ish form
+my $pi ::= 3 + rand;

Task/Enforced-immutability/Ruby/enforced-immutability-1.rb

@@ -1,4 +1,4 @@
-puts msg = "Hello World"
+msg = "Hello World"
 msg << "!"
 puts msg                #=> Hello World!
 
@@ -12,10 +12,9 @@ rescue => e
 end
 
 puts msg                #=> Hello World!
-
 msg2 = msg
 
-# An object is frozen and it is not a variable.
+# The object is frozen, not the variable.
 msg = "hello world"     # A new object was assigned to the variable.
 
 puts msg.frozen?        #=> false

Task/Enforced-immutability/Ruby/enforced-immutability-2.rb

@@ -0,0 +1,8 @@
+# There are two methods in the copy of the object.
+msg = "Hello World!".freeze
+msg2 = msg.clone        # Copies the frozen and tainted state of obj.
+msg3 = msg.dup          # It doesn't copy the status (frozen, tainted) of obj.
+puts msg2               #=> Hello World!
+puts msg3               #=> Hello World!
+puts msg2.frozen?       #=> true
+puts msg3.frozen?       #=> false