fix(xref): raise on --min-cycle-label <= 0#15027
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Provides an error message in favor of
```
mix xref graph --format cycles --min-cycle-label 0 --label compile-connected
** (FunctionClauseError) no function clause matching in Enum.count_until/3
The following arguments were given to Enum.count_until/3:
# 1
[{"lib/foo.ex", nil}, {"lib/bar.ex", nil}]
# 2
#Function<4.83728021/1 in Mix.Tasks.Xref.cycle_filter_fn/1>
# 3
0
Attempted function clauses (showing 1 out of 1):
def count_until(enumerable, fun, limit) when is_integer(limit) and limit > 0
(elixir 1.19.4) lib/enum.ex:783: Enum.count_until/3
(mix 1.19.4) lib/mix/tasks/xref.ex:1247: anonymous fn/3 in Mi
```
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Dec 30, 2025
As a follow up to elixir-lang#15027, provide a nicer error message when invoking `Enum.count_until` with an invalid limit
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Provides an error message in favor of