http://d.puremagic.com/issues/show_bug.cgi?id=4694
Summary: Unused last assignment warning
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: diagnostic
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: bearophile_h...@eml.cc
--- Comment #0 from bearophile_h...@eml.cc 2010-08-20 14:44:40 PDT ---
This enhancement request is about a warning that helps avoid some kinds of
bugs.
(This is related but distinct from the enhancement request of bug 3960
This has nothing to do with uninitialized variables, it's kind of the opposite
problem).
The "Unused last assignment warning" means that you assign something to a
variable, and then you do nothing with it.
The compiler is often able to remove the dead code, but the presence of this
situation may denote low quality code, or code where the programmer has
forgotten to use the variable. In both cases it's useful to find such
situations.
void main() {
int x;
x = 10; // warning here
}
Here 'x' is not an unused variable, because the code does something with it, so
there is no warning for unused variable (bug 3960 ), but this code deserves a
warning anyway because the last value assigned to x is not unused.
It is better to not show this warning if the variable address is assigned to a
pointer or similar things.
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