Closed as not planned
Description
Description
When using Expression.TryFault with a return label, compiling with preferInterpretation: true returns a different value than with preferInterpretation: false
Reproduction Steps
using static System.Linq.Expressions.Expression;
[TestClass]
public class ExpressionTests
{
[DataTestMethod]
[DataRow( false )]
[DataRow( true )]
public void TryFault_ShouldRunSuccessfully_WithReturnLabel( bool interpret )
{
var x = Parameter( typeof( int ), "x" );
var resultLabel = Label( typeof( int ), "exit" );
// Arrange
var block = Block(
[x],
TryFault(
Block(
Assign( x, Constant( 1 ) ),
Return( resultLabel, x )
),
Assign( x, Constant( 2 ) )
),
Label( resultLabel, defaultValue: Constant( 3 ) )
);
var lambda = Lambda<Func<int>>( block );
var compiledLambda = lambda.Compile( preferInterpretation: interpret );
// Act
var result = compiledLambda();
//Assert
Assert.AreEqual( 1, result );
}
}Expected behavior
Both versions of the test should return 1
Actual behavior
When run with preferInterpretation, the result is 3, which is the default value of the return.
Regression?
No response
Known Workarounds
The current workaround is to write this as a TryFinally but with an additional parameter to track exceptions.
Configuration
- Tested on .NET 8 and 9
- Windows 11 Pro
- Intel x64
I don't believe the configuration matters.
Other information
I assume there is something incorrect with the instructions for entering and exiting faults when using a return label.