"bin-op failed: the only supported operation on locations is +ₗ #i, got < #(loc 2)")
: val + Error
"fail compare pairs"
: string
= inr
(Stuck
"bin-op failed: one of (#0, #1) and (#0, #1) must be unboxed to compare: (#0, #1): pairs are large and considered boxed, must compare by field, (#0, #1): pairs are large and considered boxed, must compare by field")