Fix crash when accessing mat[i,j] and mat[i] is unbound
#4407
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For a plist-of-plists matrix `mat`, accessing `mat[i,j]` crashed if `mat[i]` was unbound and i in [1..Length(mat)]. Also, if `mat[i,j]` is not bound, then it now raises an error instead of returning nothing.
fingolfin
added
kind: bug
fingolfin
changed the title
mat[i,j] and mat[i] is unboundmat[i,j] and mat[i] is unbound
fingolfin
added
the
release notes: use title
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For a plist-of-plists matrix
mat, accessingmat[i,j]crashed ifmat[i]was unbound and i in [1..Length(mat)].
Also, if
mat[i,j]is not bound, then it now raises an error instead ofreturning nothing.