"libguile/fluid.h" to find out more. It is accessible from Scheme with
the following functions and macros:
+** struct-vtable-offset renamed to vtable-offset-user
+
+** New constants: vtable-index-layout, vtable-index-vtable, vtable-index-printer
+
+** There is now a fourth (optional) argument to make-vtable-vtable and
+ make-struct when constructing new types (vtables). This argument
+ initializes field vtable-index-printer of the vtable.
+
Function: make-fluid
Create a new fluid object. Fluids are not special variables or