unary minus incorrectly acts as the negation operator on %t
@mottelet)
Reported by Stéphane MOTTELET (minus sign incorrectly acts as the negation operator on booleans. Moreover, it depends on the context, as it correctly works in the second and third example below.
HOW TO REPRODUCE THE BUG:
-------------------------
--> -%t
ans =
F
--> -%t+0
ans =
-1.
--> 0-%t
ans =
-1.