Configurable imports with prefixes doesn't work as expected about sdk

[lrhn]

This should just e a compile-time error. The as clause goes after the if clauses.

If you write it as

import 'impl.dart' if (dart.library.io) 'impl_io.dart' as impl;

it should do what you intend.

Grammatically the 'impl.dart' if (dart.library.io) 'impl_io.dart' is a single production <configurableUri> which is either a URI or a URI followed by one or more conditional URIs.

Filing as parser bug, it shouldn't be allowed to parse with an if ... after the prefix.

[userAdityaa]

Hey, I'm new to contributing to dart. Can you just help with reproducing this error to me ?
As per my knowledge @lrhn is right, and this is just an issue that should be solved by the following code written.