Added build result struct

src/build/Build.go

@@ -18,7 +18,7 @@ func New(files ...string) *Build {
 }
 
 // Run parses the input files and generates an executable file.
-func (build *Build) Run() (map[string]*Function, error) {
+func (build *Build) Run() (Result, error) {
 	functions, errors := scan(build.Files)
 	return compile(functions, errors)
 }