matrix-accesses-are-triggers.dfy(8,11): Warning: Selected triggers: {m[i, j]} (may loop with "m[j, i + 1]")
 /!\ Suppressing loops would leave this expression without triggers.
matrix-accesses-are-triggers.dfy(8,81): Error: index 0 out of range
Execution trace:
    (0,0): anon0
    (0,0): anon4_Then
matrix-accesses-are-triggers.dfy(8,86): Error: index 1 out of range
Execution trace:
    (0,0): anon0
    (0,0): anon4_Then

Dafny program verifier finished with 1 verified, 2 errors