System.InvalidProgramException when using loop

[bluewingHuang]

I'm trying to compile an expression which uses Loop. The following code produces an System.InvalidProgramException when being run. The expression tree does compile correctly with the .NETs Compile() method.

` [TestMethod]
public void Nest_loop_with_break_return_value()
{
// Creating a label that represents the return value
var result = Variable(typeof(int), "result");
var x = Variable(typeof(int), "x");

        LabelTarget endMain = Label(typeof(int), "endMain");
        LabelTarget endSub1 = Label(typeof(void), "endSub1");
        LabelTarget continue1 = Label(typeof(void), "continue1");

        var loopExpression = Loop(
            Block(
                Loop(
                    Block(
                        IfThen(GreaterThanOrEqual(x, Constant(10)),
                            Break(endMain, result)),
                        AddAssign(result, Constant(1)),
                        AddAssign(x, Constant(1))
                        ),
                    endSub1,
                    continue1
                    )
                ),
            endMain
            );

        BlockExpression body = Block(
            new ParameterExpression[] { result, x },
            loopExpression
        );

        var loopFunc = Expression.Lambda<Func<int>>(body).CompileFast(true);
        //var loopFunc = Expression.Lambda<Func<int>>(body).Compile();

        var calResult = loopFunc();
        Assert.AreEqual(10, calResult);
    }`

Debug Trace:
MarkLabel: loopBodyLabel -- TryEmitLoop:2536
MarkLabel: loopBodyLabel -- TryEmitLoop:2536
MarkLabel: continueLabel -- TryEmitLoop:2544
ldloc.1 -- EmitLoadLocalVariable:6578
ldc.i4.s 10 -- EmitLoadConstantInt:6545
clt -- TryEmitComparison:6063
ldc.i4.0 -- EmitEqualToZeroOrNull:6482
ceq -- EmitEqualToZeroOrNull:6483
brfalse labelIfFalse -- TryEmitConditional:6460
ldloc.0 -- EmitLoadLocalVariable:6576
br labelInfo.GetOrDefineLabel(il) -- TryEmitGoto:2672
MarkLabel: labelIfFalse -- TryEmitConditional:6466
ldloc.0 -- EmitLoadLocalVariable:6576
ldc.i4.1 -- EmitLoadConstantInt:6535
add -- TryEmitArithmeticOperation:6328
stloc.0 -- EmitStoreLocalVariable:6603
ldloc.1 -- EmitLoadLocalVariable:6578
ldc.i4.1 -- EmitLoadConstantInt:6535
add -- TryEmitArithmeticOperation:6328
stloc.2 -- EmitStoreAndLoadLocalVariable:6641
ldloc.2 -- EmitStoreAndLoadLocalVariable:6642
stloc.1 -- EmitStoreLocalVariable:6605
ldloc.2 -- EmitLoadLocalVariable:6580
br loopBodyLabel -- TryEmitLoop:2551
MarkLabel: breakLabel -- TryEmitLoop:2559
br loopBodyLabel -- TryEmitLoop:2551
MarkLabel: breakLabel -- TryEmitLoop:2559
ret -- TryCompileBoundToFirstClosureParam:562

[dadhi]

Hi. Thanks for the test. What is version of FEC?

[bluewingHuang]

Hi. Thanks for the test. What is version of FEC?

v5.3.0