Incorrect error message on Debug a = a+1

[blueznl]

Very minor error message:

Debug a=a+1 reports:

Line 14: Comparisons (=, <, >, =< and >=) are only supported with keywords like If, While, Until or within Bool().

However, a=a+1 in this case isn't a comparison but an evaluation / assignment

(I just can imagine you will ignore this one )

[Demivec]

The error reported as 'Comparisons (=, <, >, =< and >=) are only supported with keywords like If, While, Until or within Bool().' makes sense when the code be interpreted like this (imaginary parenthesis added to emphasize interpretation):

Code: Select all

Debug (a=a)+1

Assignment is a statement and not an operator and so can't be included in any other statements or expressions, including debug statements (I am ignoring the syntactic sugar that combines assignment along with a math operator, i.e. a + 1 for a = a + 1). So it does not seem to be necessary to guard against it in the list of errors generated for other statements, IMHO.

I don't think there is a problem with the way it currently is. What would you suggest the error mesage say instead?

[Josh]

However, a=a+1 in this case isn't a comparison but an evaluation / assignment

That's correct, but in connection with Debug the whole a=a+1 is a rhs term and so the '=' can only be interpreted as a comparsion sign. No bug.

[Little John]

in connection with Debug the whole a=a+1 is a rhs term and so the '=' can only be interpreted as a comparsion sign. No bug.

That's right.

If a should be incremented by 1, and then the value of a should be shown, it must read like this:

Code: Select all

a = a + 1    ; or just a + 1
Debug a

[blueznl]

As I said, it is not important

I just accidentally entered a 'Debug' in the wrong line of code, so (just an example below!)

Code: Select all

a = 5
a = a+1
If a > 10

became

Code: Select all

a = 5
Debug a = a+1
If a > 10

So you can see how my PERCEPTION (cheap cop-out, I know) was it was an assignment.

[Dude]

blueznl, your Survival Guide has this very example in it, here:

http://ninelizards.com/purebasic/pureba ... bug_output

But your explanation of it says that "Debug a = a+1" always outputs 1, instead of saying it raises a Bool() error.

You can see this just above the "11.5 Variable Viewer" heading. FYI.

[blueznl]

Another part that needs a rewrite... The guide is beginning to age...