Interpreter prints unexpected values when auto is used for pointer types

[guitargeek]

• Checked for duplicates

When the auto keyword is used in the interpreter to substitute pointer types, the value of the pointer is not printed out correctly, even though the pointer points to the correct variable.

A few simple interpreter commands to reproduce the problem:

root [0] int x = 1
(int) 1
root [1] int y = 2
(int) 2
root [2] auto xp = &x
(int *) @0x7ffe114d3bb8  <- WRONG!
root [3] auto yp = &y
(int *) @0x7ffe114d3bb8  <- WRONG!
root [4] &x
(int *) 0x7f3bcb682018
root [5] &y
(int *) 0x7f3bcb68201c
root [6] xp
(int *) @0x7ffe114d3bb8  <- WRONG!
root [7] yp
(int *) @0x7ffe114d3bb8  <- WRONG!
root [8] *xp
(int) 1
root [9] *yp
(int) 2

However, if one uses auto * instead of auto, one gets the expected behavior:

root [0] int x = 1
(int) 1
root [1] int y = 2
(int) 2
root [2] auto * xp = &x
(int *) 0x7f8f0a394018  <- CORRECT!
root [3] auto * yp = &y
(int *) 0x7f8f0a39401c  <- CORRECT!
root [4] &x
(int *) 0x7f8f0a394018
root [5] &y
(int *) 0x7f8f0a39401c
root [6] xp
(int *) 0x7f8f0a394018  <- CORRECT!
root [7] yp
(int *) 0x7f8f0a39401c  <- CORRECT!
root [8] *xp
(int) 1
root [9] *yp
(int) 2

Can we fix the interpreter such that it also prints the correct pointer values when auto is used?

This problem was originally spotted on the ROOT forum:
https://root-forum.cern.ch/t/wrong-object-returned-in-root-when-using-auto-keyword

[guitargeek]

I tried out if this issue is still relevant, and I can still reproduce it with ROOT 6.26. However, in ROOT master it's gone! I'll close the issue and mark it as fixed in 6.28.