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2016-11-23Implement value type propagation on expansionBoris Kolpackov2-3/+3
Currently, we only propagate types of sole, unquoted expansions (variable, function call, or eval context), similar to NULL. To untypify the value, simply quote it.
2016-11-23Implement few builtin functions that can operate on any valueBoris Kolpackov1-2/+2
type() null() empty () identity()
2016-11-22Use diagnostics facility from libbutlBoris Kolpackov1-1/+1
2016-11-21Change build.driver/path variable to build.path/process_pathBoris Kolpackov1-4/+4
2016-11-21Add process_path.{recall,effect} build2 functionsBoris Kolpackov1-1/+2
2016-11-21Add support for derived-to-base function overload resolutionBoris Kolpackov2-7/+16
2016-11-18Add function machinery, implement path.normalize()Boris Kolpackov4-0/+284
Note that multi-argument functions are not yet "callable" since there is no support for value packs.