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Hello Joo ChurlSoo,
The order of evaluation of the expressions used to
initialize bindings in LET is explicitly left
unspecified in the Scheme standard, Section 4.2.2:
"Semantics: The <init>s are evaluated in the
current environment (in some unspecified order), ..."
(Consider for example
http://www.schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-7.html#%25_sec_4.2.2)
This means your programs should not rely on a
particular ordering of the bindings.
The difference becomes apparent in SRFI-LET because my
reference implementation uses this freedom to
recognize ordinary single-value bindings and collect
them into an ordinary LET.
Sebastian.
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