HOF function errors

[Sorin Marian Nasoi]

There are some errors in some of the HOS function implementations causing 9 test-case failures:

Please see:
- 'fn-fold-left' test-set, 'fold-left-009' test-case
- 'fn-fold-right' test-set fold-right-005, fold-right-006, fold-right-007, fold-right-014, fold-right-015, fold-right-016, fold-right-017
- 'fn-for-each-pair' test-set fn-for-each-pair-026

Please see attached logs.

[Sorin Marian Nasoi (sorin.marian.nasoi)]

Please also see the 4 failures in 'fn-function-lookup' test-set

[Sorin Marian Nasoi (sorin.marian.nasoi)]

Current test-cases linked to this bug report are:

EXPECTED_FOTS_FAILURE (fn-fold-left fold-left-009 1187685)
EXPECTED_FOTS_FAILURE (fn-for-each-pair fn-for-each-pair-026 1187685)
EXPECTED_FOTS_FAILURE (fn-function-lookup fn-function-lookup-062 1187685)
EXPECTED_FOTS_FAILURE (prod-NamedFunctionRef function-literal-062 1187685)