reserveword

I saw discussion in https://github.com/MinecraftForge/ForgeGradle/pull/796 about creating custom channel. So now I want to use yarn mapping instead of (not clearly licensed) official mapping, what should I do? I tried this code: channelProviders.addProvider(new ChannelProvider() { Set<String> getChannels() { println "channels" return ImmutableSet.of('yarn') } File getMappingsFile(MCPRepo mcpRepo, Project project, String channel, String version) { String desc = "net.fabricmc:yarn:" + version + ":v2@zip"; println 'get' + desc return MavenArtifactDownloader.manual(project, desc, false); } }) but it didn't work. It seems that `channelProviders` get reset after I changed it. error says: Error getting artifact: net.minecraft:mappings_yarn:1.0.1:null@zip from MCPRepo java.lang.IllegalArgumentException: Unknown mapping provider: yarn_1, currently loaded: [stable_nodoc, snapshot_nodoc, stable, official, snapshot] I would expect this yarn project has different syntax from mcp, but in that case I can write another program to fix that.

But I was told that official mappings have legal issues, and should be avoided, is it still a problem now?