Cannot assign 'STRING' text to a field.

[tamasmiklossy]

Steps to reproduce:

1. Create a new Xtext project with the Xtext new project wizard.

2. Modify the grammar to

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

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

	Model:
		a = 'STRING';

3. Execute the GenerateMyDsl.mwe2 workflow.

4. Modify the generated loadModel() test case in the MyDslParsingTest.xtend file to

	@Test
	def void loadModel() {
		val result = parseHelper.parse('''
			STRING
		''')
		Assertions.assertNotNull(result)
		println(result.a)
		val errors = result.eResource.errors
		Assertions.assertTrue(errors.isEmpty, '''Unexpected errors: «errors.join(", ")»''')
	}

5. The test case will fail with the error message: Unexpected errors: XtextSyntaxDiagnostic: null:1 String literal is not properly closed

[cdietrich]

Is this from value converter? Does it work if you move it to a data type rule

[tamasmiklossy]

Is this from value converter?

Yes, this message comes from the STRINGValueConverter class. It seems there is a collision with the terminal STRING rule defined in the Terminals.xtext file.

Does it work if you move it to a data type rule?

Yes.