Optimization crashes with trivial expressions.

[johannfelixsoden]

After commit 59aca15, the optimization fails with very trivial expressions like:

Local expr=1;
.sort
Format O2;
#Optimize expr;
.end

Error message:

test.frm Line 5 ==> Illegal empty value for preprocessor variable optimscheme_

The current git master and the "4.1" FORM binaries (build date Jan 13 2014) supplied on the FORM website are affected, but not the 4.1 release on github.

As we are using FORM in an automated environment, it would make additional effort to catch trivial expressions.

[johannfelixsoden]

Sorry, this report is a duplicate of issue #7. I will therefore close it.

[tueda]

FYI: This was a completely different bug from #7. As of November 2018, it has been fixed, while #7 still remains and leads to a crash.

It was introduced by 59aca15 and resolved by 84d7188.