Compiler normalizes paths before passing them to an fs

compiler/resolver.go

@@ -106,9 +106,8 @@ func (resolver *Resolver) ResolveCwd (address entity.Address) (string, error) {
 
 // openAbsolute exists because fs.FS implementations do not understand absolute
 // paths, which the FSPL compiler runs on. It converts an absolute path to a
-// path relative to "/" and opens the file.
+// slash path relative to "/" and opens the file.
 func openAbsolute (filesystem fs.FS, path string) (fs.File, error) {
-	path, err := filepath.Rel("/", path)
-	if err != nil { return nil, err }
+	path = strings.TrimPrefix(filepath.ToSlash(path), "/")
 	return filesystem.Open(path)
 }