ifs_same_cond

What it does

Checks for branches in if blocks with equivalent conditions.

Why this is bad

This is most likely a copy and paste error.

Example

if foo then
    print(1)
elseif foo then
    print(1)
end

Remarks

This ignores conditions that could have side effects, such as function calls. This will not lint:

if foo() then
    print(1)
elseif foo() then
    print(1)
end

...as the result of foo() could be different the second time it is called.