Right now if there is a diff between the actual and expected results,
the expected file will be overwritten. This may be annoying. To make it
controlled we introduce BLESS option.
This means that the expected files won't be regenerated unless this
environment variable is set.
Therefore to regenerate the tests use:
BLESS=1 cargo test
Previously, functions that appear in multiple places
(exported, start function, table) would generate a thunk
for each place they appear in. Those additional thunks are
identical and only only one of them would be referenced.
Main offender are tables with redundant entries.
This commit eliminates those duplicate thunks without adding
any additional overhead.
* No need for mem::replace when doing a simple assignment
* Allow specifying the module of the imported 'gas' function
This allows users to place the imported function inside a custom
module instead of the generic 'env' module.
Sergey Shulepov