Bug? [Solved]In debug, re-using a variable previously used in a for declaration

[alwaysbusy]

Only in Debug mode (in release mode it is not a problem)!

When one uses a variable for a 'for' loop, you can't re-use it as a dim later

Error:

B4J Version: 6.01
Parsing code.    (0.00s)
Compiling code.    Error
Error compiling program.
Error description: Current declaration does not match previous one.
Make sure to declare the variable before it is used in a For loop.
Error occurred on line: 17
Dim i As Int

Code to reproduce:

'Non-UI application (console / server application)
#Region Project Attributes
   #CommandLineArgs:
   #MergeLibraries: True
#End Region

Sub Process_Globals
 
End Sub

Sub AppStart (Args() As String)
   For i = 0 To 10 ' <----- used the i variable
       Log(i)
   Next
 
   For k = 0 To 10
       Dim i As Int  ' <------ now using it 'normal', gives the error
       i = k
       Log(k)
   Next
 
   StartMessageLoop
End Sub

 

[LucaMs]

For I As Int = 0 to 10

and it should work.

You should always declare the type of variables.

 

[alwaysbusy]

and it should work.

Sure, probably does. Just want to point out the difference in Debug/Release mode. Works in release, does not in Debug.

 

[Erel]

This is not a bug. As you can see in the error message the compiler tells you how to solve it.
This is a limitation related to a debugger optimization.

For I As Int = 0 to 10

You cannot set the type here.

The way to solve it is by declaring the variable before the For loop:

Dim i as Int
For i = 0 To 10

Note that you don't need to always declare the variable before the for loop. In fact it is better not to.
This is only required when you first use a new variable in a for loop and later dim it.

 

[LucaMs]

You cannot set the type here.

Very strange. Before posting that code I tried and got no warnings; why? I wrote the code in a new empty project, not saved

 

[alwaysbusy]

This is a limitation related to a debugger optimization.

I did see compiler message, but didn't know it was debug only. Makes sense.