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Build Identifier: Xtext 2.0.1 xtend2: the following statement raises a "no viable alternative at input 'extends'" error: class McpRoot implements IGenerator extends McpGenerator { } this works: class McpRoot extends McpGenerator implements IGenerator { looks like you forgot a "&" in your xtext grammar... ;-) ~serano Reproducible: Always Steps to Reproduce: 1. see details 2. 3.
This works the same way as in Java: extends Type may not appear after implements Interface.