extend method
Returns a child of this
that counts as both this platform's identifier
and the new identifier
.
This may not be called on a platform that's already a child.
Implementation
Runtime extend(String name, String identifier) {
if (parent == null) {
return Runtime._child(
name, identifier, defaultCompiler, supportedCompilers, this);
}
throw StateError('A child platform may not be extended.');
}