var Main;
ctl main(Main);

org.opentest4j.AssertionFailedError: 
Unexpected errors:
XtextSyntaxDiagnostic: null:10 mismatched input 'Main' expecting RULE_ID, XtextSyntaxDiagnostic: null:10 mismatched input ')' expecting '(' ==> expected: <true> but was: <false>

/*
 * generated by Xtext 2.15.0-SNAPSHOT
 */
package org.xtext.example.mydsl.tests

import com.google.inject.Inject
import org.eclipse.xtext.testing.InjectWith
import org.eclipse.xtext.testing.extensions.InjectionExtension
import org.eclipse.xtext.testing.util.ParseHelper
import org.junit.jupiter.api.Assertions
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.^extension.ExtendWith
import org.xtext.example.mydsl.myDsl.Model

@ExtendWith(InjectionExtension)
@InjectWith(MyDslInjectorProvider)
class MyDslParsingTest {
	@Inject
	ParseHelper<Model> parseHelper
	
	@Test
	def void test01() {
		val result = parseHelper.parse('''
			ctl option(*NODEBUGIO :*SRCSTMT);

			VAR Foo;
			ctl main(Foo);

			var Bar;
			ctl main(Bar);

			var Main;
			ctl main(Main); // <<< ERROR HERE!!! :( 
		''')
		Assertions.assertNotNull(result)
		val errors = result.eResource.errors
		Assertions.assertTrue(errors.isEmpty, '''Unexpected errors: «errors.join(", ")»''')
	}

}

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	controls+=Statements+
;
Statements:
	Control	|
	VarDef	|
	ValDef
;
Control:
	'CTL' keywords+=ControlOption+ ';'
;
ControlOption:
	ControlOptionMAIN	|
	ControlOptionOPTION
;
ControlOptionMAIN:
	'MAIN' '(' ref=[VarOrDefRef] ')'
;
ControlOptionOPTION:
	'OPTION' '(' options+=OptionOptions (':' options+=OptionOptions)* ')'
;
enum OptionOptions:
	XREF='*XREF'			|
	NOXREF='*NOXREF'		|
	SECLVL='*SECLVL'		|
	NOSECLVL='*NOSECLVL'	|
	SHOWCPY='*SHOWCPY'		|
	NOSHOWCPY='*NOSHOWCPY'	|
	EXPDDS='*EXPDDS'		|
	NOEXPDDS='*NOEXPDDS'	|
	EXP='*EXT'				|
	NOEXP='*NOEXT'			|
	SHOWSKP='*SHOWSKP'		|
	NOSHOWSKP='*NOSHOWSKP'	|
	SRCSTMT='*SRCSTMT'		|
	NOSRCSTMT='*NOSRCSTMT'	|
	DEBUGIO='*DEBUGIO'		|
	NODEBUGIO='*NODEBUGIO'	|
	UNREF='*UNREF'			|
	NOUNREF='*NOUNREF'
;
VarDef:
	'VAR' name=ValidID ';'
;
ValDef:
	'VAL' name=ValidID ';'
;
VarOrDefRef:
	VarDef | ValDef
;
ValidID:
	ID | KEWORD
;
KEWORD:
	'CTL' | 'MAIN' | 'OPION' | 'VAR' | 'VAL'
;

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	controls+=Statements+
;
Statements:
	Control	|
	VarDef	|
	ValDef
;
Control:
	TCTL keywords+=ControlOption+ ';'
;
ControlOption:
	ControlOptionMAIN	|
	ControlOptionOPTION
;
ControlOptionMAIN:
	TMAIN '(' ref=[VarOrDefRef] ')'
;
ControlOptionOPTION:
	TOPTION '(' options+=OptionOptions (':' options+=OptionOptions)* ')'
;
enum OptionOptions:
	XREF='*XREF'			|
	NOXREF='*NOXREF'		|
	SECLVL='*SECLVL'		|
	NOSECLVL='*NOSECLVL'	|
	SHOWCPY='*SHOWCPY'		|
	NOSHOWCPY='*NOSHOWCPY'	|
	EXPDDS='*EXPDDS'		|
	NOEXPDDS='*NOEXPDDS'	|
	EXP='*EXT'				|
	NOEXP='*NOEXT'			|
	SHOWSKP='*SHOWSKP'		|
	NOSHOWSKP='*NOSHOWSKP'	|
	SRCSTMT='*SRCSTMT'		|
	NOSRCSTMT='*NOSRCSTMT'	|
	DEBUGIO='*DEBUGIO'		|
	NODEBUGIO='*NODEBUGIO'	|
	UNREF='*UNREF'			|
	NOUNREF='*NOUNREF'
;
VarDef:
	TVAR name=MyID ';'
;
ValDef:
	TVAL name=MyID ';'
;
VarOrDefRef:
	VarDef | ValDef
;
MyID:
	TMAIN | ID
;

terminal TCTL:
	('c'|'C')('t'|'T')('l'|'L')
;
terminal TMAIN:
	('m'|'M')('a'|'A')('i'|'I')('n'|'N')
;
terminal TOPTION:
	('o'|'O')('p'|'P')('t'|'T')('i'|'I')('o'|'O')('n'|'N')
;
terminal TVAR:
	('v'|'V')('a'|'A')('r'|'R')
;
terminal TVAL:
	('v'|'V')('a'|'A')('l'|'L')
;

module org.xtext.example.mydsl.GenerateMyDsl

import org.eclipse.xtext.xtext.generator.*
import org.eclipse.xtext.xtext.generator.model.project.*

var rootPath = ".."

Workflow {
	
	component = XtextGenerator {
		configuration = {
			project = StandardProjectConfig {
				baseName = "org.xtext.example.mydsl"
				rootPath = rootPath
				runtimeTest = {
					enabled = true
				}
				eclipsePlugin = {
					enabled = true
				}
				eclipsePluginTest = {
					enabled = true
				}
				web = {
					enabled = true
				}
				createEclipseMetaData = true
			}
			code = {
				encoding = "windows-1252"
				lineDelimiter = "\r\n"
				fileHeader = "/*\n * generated by Xtext \${version}\n */"
			}
		}
		language = StandardLanguage {
			name = "org.xtext.example.mydsl.MyDsl"
			fileExtensions = "mydsl"

			serializer = {
				generateStub = false
			}
			validator = {
				// composedCheck = "org.eclipse.xtext.validation.NamesAreUniqueValidator"
			}
			junitSupport = {
				junitVersion = "5"
			}
			parserGenerator = {
				debugGrammar = true
				options = {
					ignoreCase = true
				}
			}
			scopeProvider = {
				ignoreCase = true
			}
		}
	}
}