If the string filename names an existing file, the try-load
procedure reads Scheme source code expressions and definitions from the
file and evaluates them sequentially and returns
#t. If not,
#f. The try-load procedure does not affect the
values returned by
Is set to the pathname given as argument to
(see Compiling And Linking in Hobbit).
*load-pathname* is used to compute the value of
program-vicinity in SLIB.
Alias for eval in SLIB.
Returns the result of reading an expression from str and
eval-string does not change
Reads and evaluates all the expressions from str. As with
load, the value returned is unspecified.
Returns the current line number of the file currently being loaded.
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