better drop background syntax if entity depends on parameters;
more direct Type_Infer_Context.const_type instead of Syntax.check_term, which expands abbreviations (and potentially more);
syntax: glob
*~
*.class
*.jar
.DS_Store
syntax: regexp
^contrib
^heaps/
^browser_info/
^doc-src/.*\.aux
^doc-src/.*\.bbl
^doc-src/.*\.blg
^doc-src/.*\.dvi
^doc-src/.*\.idx
^doc-src/.*\.ind
^doc-src/.*\.lof
^doc-src/.*\.log
^doc-src/.*\.out
^doc-src/.*\.toc
^src/Tools/jEdit/dist/