# Mercury 'Do Loop' 'Continue Do' issue
**URL:** https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083
**Category:** Mercury
**Tags:** mercury
**Created:** [March 16, 2026, 2:00pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083 "2026-03-16T14:00:17Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@chikega](https://talk.remobjects.com/u/chikega)
#### Post date: [March 16, 2026, 2:00pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/1 "2026-03-16T14:00:17Z")
Hi Marc,
I think I may have found an issue, or at least an ambiguity, with `Continue` inside `Do … Loop` in Mercury.
I tested this minimal example:
```vb
Module Program
Sub Main(args As String())
Do
writeLn("test")
Continue Do
Loop
End Sub
End Module
```
This produces errors like:
- Wrong `Continue` modifier: can not find `Do` in the current context
- One of `do`, `For`, `While` expected, got `End`
If I change `Continue Do` to just `Continue`, it compiles, but of course that creates an infinite loop in this minimal example, which is expected.
What seems more interesting is that in a larger simple example, `Continue Do` does not seem to bind correctly to the enclosing `Do ... Loop`. It appears the compiler/parser is not recognizing the immediate surrounding `Do`, even though the statement is clearly inside that loop and only nested within `If ... End If` blocks.
```vb
Module Program
Sub Main(args As String())
Write("What is your name? ")
Dim name As String = readLn()
If String.IsNullOrWhiteSpace(name) Then
writeLn("Name cannot be empty.")
Return
End If
writeLn($"It is nice to meet you, {name}!")
Dim age As Integer
Do
Write("How old are you? ")
Dim ageInput As String = readLn()
If Not Integer.TryParse(ageInput, age) Then
writeLn("Please enter a valid whole number for age.")
' Continue Do
Continue do
End If
If age < 0 Then
writeLn("Age cannot be negative.")
' Continue Do
Continue
End If
Exit Do
Loop
Dim gpa As Double
Do
Write("What is your GPA? ")
Dim gpaInput As String = readLn()
If Not Double.TryParse(gpaInput, gpa) Then
writeLn("Please enter a valid numeric value for GPA.")
' Continue Do
Continue
End If
If gpa < 0.0 OrElse gpa > 4.0 Then
writeLn("GPA must be between 0.0 and 4.0.")
' Continue Do
Continue
End If
Exit Do
Loop
writeLn($"So, {name}, you are {age} years old and your GPA is {gpa:F2} ... stellar!")
End Sub
End Module
```
So my question is:
- Is `Continue Do` unsupported in Mercury?
- Or is this a parser/compiler issue with loop association and/or error reporting?
Thanks,
Gary
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [March 20, 2026, 11:51pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/2 "2026-03-20T23:51:37Z")
> [@chikega](#):
>
> - Wrong `Continue` modifier: can not find `Do` in the current context
>
> - One of `do`, `For`, `While` expected, got `End`
Curious, it says Do lowercase?
In any case, sounds like a bug; will log.
---
### Author:  [@RemObjectsSoftware](https://talk.remobjects.com/u/RemObjectsSoftware)
#### Post date: [March 20, 2026, 11:52pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/3 "2026-03-20T23:52:07Z")
Logged as [bugs://E27590](https://www.remobjects.com/portal/bugs/?id=E27590).
---
### Author:  [@chikega](https://talk.remobjects.com/u/chikega)
#### Post date: [March 22, 2026, 5:40pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/4 "2026-03-22T17:40:42Z")
Thanks for taking a look, Marc! 🤓👍
---
### Author:  [@RemObjectsSoftware](https://talk.remobjects.com/u/RemObjectsSoftware)
#### Post date: [April 10, 2026, 7:53am UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/5 "2026-04-10T07:53:48Z")
[bugs://E27590](https://www.remobjects.com/portal/bugs/?id=E27590) was closed as fixed.
---
### Author:  [@chikega](https://talk.remobjects.com/u/chikega)
#### Post date: [April 11, 2026, 4:50pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/6 "2026-04-11T16:50:17Z")
I can confirm that the issue has been rectified with the latest build .3073
Thank you @mh ! 🚀🚀🚀
```vb
Module Program
Sub Main(args As String())
Dim i As Integer = 0
Do
If i = 10 Then
Exit Do
Else
Console.WriteLine($"{i}) test")
i += 1
Continue Do
End If
Loop
End Sub
End Module
```
Output:
```bash
0) test
1) test
2) test
3) test
4) test
5) test
6) test
7) test
8) test
9) test
```
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [April 11, 2026, 7:35pm UTC](https://talk.remobjects.com/t/mercury-do-loop-continue-do-issue/33083/7 "2026-04-11T19:35:40Z")
> [@chikega](#):
>
> I can confirm that the issue has been rectified with the latest build .3073
> Thank you @mh ! 🚀🚀🚀
Happy to hear! Thanx for confirming.