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I have created my DSL as an extension of Xtend. Everything is working except the content assist feature. In some particular cases, the exception below is thrown. The typical use case is (where "agent" is a keyword of my DSL): agent XXX { def myFunction : float { Math. } } If I ask the content assistant to give proposals after "Math.", it fails with: ... Caused by: java.lang.IllegalArgumentException: tokenType 44 seems to be invalid. at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.AbstractInternalContentAssistParser.createLookAheadTerminal(AbstractInternalContentAssistParser.java:533) at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.AbstractInternalContentAssistParser$DefaultFollowElementFactory.createFollowElement(AbstractInternalContentAssistParser.java:76) at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.AbstractInternalContentAssistParser.createFollowElement(AbstractInternalContentAssistParser.java:509) at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.AbstractInternalContentAssistParser$5.announceEof(AbstractInternalContentAssistParser.java:445) at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.AbstractInternalContentAssistParser.announceEof(AbstractInternalContentAssistParser.java:570) at org.eclipse.xtext.ui.editor.contentassist.antlr.ObservableXtextTokenStream.LA(ObservableXtextTokenStream.java:48) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XMemberFeatureCall__Group__1__Impl(InternalSARLParser.java:8355) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XMemberFeatureCall__Group__1(InternalSARLParser.java:8310) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XMemberFeatureCall__Group__0(InternalSARLParser.java:8232) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.ruleXMemberFeatureCall(InternalSARLParser.java:7763) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XPostfixOperation__Group__0__Impl(InternalSARLParser.java:7835) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XPostfixOperation__Group__0(InternalSARLParser.java:7791) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.ruleXPostfixOperation(InternalSARLParser.java:7593) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XCastedExpression__Group__0__Impl(InternalSARLParser.java:7234) at io.sarl.lang.ui.contentassist.antlr.internal.InternalSARLParser.rule__XCastedExpression__Group__0(InternalSARLParser.java:7190) The mwe script is located at: https://github.com/sarl/sarl/blob/master/plugins/io.sarl.lang.mwe2/src/io/sarl/lang/GenerateSARL.mwe2 The DSL grammar is: https://github.com/sarl/sarl/blob/master/plugins/io.sarl.lang/src/io/sarl/lang/SARL.xtext Forum discussion: https://www.eclipse.org/forums/index.php/t/1074655/ The function createLookAheadTerminal and related stuffs do not seem to handle keywords right.
