add ImportAs method

Author: quasilyte

dsl/dsl.go

@@ -16,6 +16,10 @@ type Matcher map[string]Var
 //	  `a/b/foo.Bar` type during the pattern execution.
 func (m Matcher) Import(pkgPath string) {}
 
+// ImportAs is like Import, but can handle "/v2" packages
+// and package name conflicts (e.g. "x/path" vs "y/path").
+func (m Matcher) ImportAs(pkgPath, localName string) {}
+
 // Match specifies a set of patterns that match a rule being defined.
 // Pattern matching succeeds if at least 1 pattern matches.
 //