[Issue 5540] Probable bug-hiding redundancies

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5540



--- Comment #6 from bearophile_hugs at eml.cc 2011-06-29 16:56:41 PDT ---
A class of bug-hiding redundancy:

if (x == 10)
    foo1();
else if (x == 20)
    foo2();
else if (x == 10) // ***
    foo3();


Another class, two assignments to the same variable in a row:

x = foo();
x = bar();


While this is OK:

x = 1;
x = x + 1;
x = foo(x);


Another class (the two branches are equal):

if (x)
    foo();
else
    foo();

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