@Test
public void testCompile_ErrorForIllegaFieldName() throws Exception {

  assertThrows(JBBPTokenizerException.class, () -> JBBPCompiler.compile("  byte _;"));
  assertThrows(JBBPTokenizerException.class, () -> JBBPCompiler.compile("  byte $a;"));
  assertThrows(JBBPTokenizerException.class, () -> JBBPCompiler.compile("  byte $$;"));
  assertThrows(JBBPTokenizerException.class, () -> JBBPCompiler.compile("  byte a.b;"));
  assertThrows(JBBPTokenizerException.class, () -> JBBPCompiler.compile("  byte 1d;"));
}