var exprTests = []exprTest{
	// Simple
	{"0", 0, true},
	{"3", 3, true},
	{"070", 8 * 7, true},
	{"0x0f", 15, true},
	{"0xFF", 255, true},
	{"9223372036854775807", 9223372036854775807, true}, // max int64
	// Unary
	{"-0", 0, true},
	{"~0", -1, true},
	{"~0*0", 0, true},
	{"+3", 3, true},
	{"-3", -3, true},
	{"-9223372036854775808", -9223372036854775808, true}, // min int64
	// Binary
	{"3+4", 3 + 4, true},

    thisObject: Any? = null
) : groovy.lang.Closure<V?>(owner, thisObject) {

    @Suppress("unused") // to be called dynamically by Groovy
    fun doCall(): V? = function()
}


/**
 * Adapts an unary Kotlin function to an unary Groovy [Closure].
 *
 * @param T the type of the single argument to the closure.
 * @param V the return type.
 * @param function the function to be adapted.
 * @param owner optional owner of the Closure.

	okfor[ir.OOR] = okforand[:]
	okfor[ir.OOROR] = okforbool[:]
	okfor[ir.OSUB] = okforarith[:]
	okfor[ir.OXOR] = okforand[:]
	okfor[ir.OLSH] = okforand[:]
	okfor[ir.ORSH] = okforand[:]

	// unary
	okfor[ir.OBITNOT] = okforand[:]
	okfor[ir.ONEG] = okforarith[:]
	okfor[ir.ONOT] = okforbool[:]
	okfor[ir.OPLUS] = okforarith[:]

	// special
	okfor[ir.OCAP] = okforcap[:]
	okfor[ir.OLEN] = okforlen[:]

        return success();
      }
    }
    return op->emitOpError("Block has no predecessor");
  }

  if (v.getDefiningOp()->getNumOperands() == 1) {
    // If the value is originating from an unary op, assume it's something
    // simple like "cast" and keep tracing.
    return traceUpwardsToArgument(v.getDefiningOp()->getOperand(0), seen, out);
  } else {
    // Typically a tf.VarHandle op.

	}
	return s
}

// A set of constants for precedence-based expression parsing.
// Non-operators have lowest precedence, followed by operators
// starting with precedence 1 up to unary operators. The highest
// precedence serves as "catch-all" precedence for selector,
// indexing, and other operator and delimiter tokens.
const (
	LowestPrec  = 0 // non-operators
	UnaryPrec   = 6
	HighestPrec = 7

					eqn := fmt.Sprintf("%s_%s %s %s_%s != %d", t.name, valname(x), op.name, t.name, valname(y), r)
					fmt.Printf("\tif %s { println(\"bad: %s\") }\n", eqn, eqn)
				}
			}
		}
		// test unary ops
		for _, op := range unops {
			for _, x := range t.testvalues() {
				r := t.trunc(op.eval(x))
				eqn := fmt.Sprintf("%s %s_%s != %d", op.name, t.name, valname(x), r)

	// X.(type)
	// Lhs := X.(type)
	TypeSwitchGuard struct {
		Lhs *Name // nil means no Lhs :=
		X   Expr  // X.(type)
		expr
	}

	Operation struct {
		Op   Operator
		X, Y Expr // Y == nil means unary expression
		expr
	}

	// Fun(ArgList[0], ArgList[1], ...)
	CallExpr struct {
		Fun     Expr
		ArgList []Expr // nil means no arguments
		HasDots bool   // last argument is followed by ...
		expr