The variable is assigned but never used

Question

int i, j;
i = j = 1;

j is highlighted by VS 2010 with warning:

The variable is assigned but never used

Why i is "used" and j - is not?

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An addition with cooperation with Daniel:

int i, j, k, l, m;
i = j = k = l = m = 1;

Only m is highlighted.

Answer 1

I think it's a bug, It should be in reverse order, = operator is a right precedent operator according to Microsoft documentation. So when we have i = j = 1 it should parse it as i = (j = 1) in this case value of j used to initialize i so the compiler should say i initiated but never used, not j.

Answer 2

Technically this should be the case for both i and j

EDIT:

I have again checked the code

int ii, jj;
ii = jj = 1;

using Reflector to generate IL I found

.maxstack 2
.locals init (
    [0] int32 ii,
    [1] int32 jj)
L_0000: nop 
L_0001: ldc.i4.1 //pushes the integer value of 1 onto the evaluation stack
L_0002: dup //copies the current topmost value on the evaluation stack, and then pushes the copy
L_0003: stloc.1 
L_0004: stloc.0 
L_0005: ret 

From this, it would make it seem that 1 is assigned to ii, and then ii is copied to jj.