Skip to content

Clarify arity mismatch message #7709

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Jul 24, 2025
Merged

Clarify arity mismatch message #7709

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
cf96360
clarify arity mismatch message
zth Jul 24, 2025
7929b79
explicitly call out supplying fewer arguments
zth Jul 24, 2025
4624817
changelog
zth Jul 24, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 2 additions & 1 deletion compiler/ml/typecore.ml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -794,7 +794,8 @@ let print_expr_type_clash ~context env loc trace ppf =
show_extra_help ppf env trace

let report_arity_mismatch ~arity_a ~arity_b ppf =
fprintf ppf "This function expected @{<info>%s@} %s, but got @{<error>%s@}"
fprintf ppf
"This function is expected to have @{<info>%s@} %s, but has @{<error>%s@}"
arity_b
(if arity_b = "1" then "argument" else "arguments")
arity_a
Expand Down
2 changes: 1 addition & 1 deletion tests/build_tests/super_errors/expected/arity_mismatch3.res.expected
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,4 +5,4 @@
1 │ Belt.Array.map([], (a, b) => 1)
2 │

This function expected 1 argument, but got 2
This function is expected to have 1 argument, but has 2
2 changes: 1 addition & 1 deletion tests/build_tests/super_errors/expected/curried_expected.res.expected
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,4 +7,4 @@
3 │ let z1 = expectCurried((x, y) => x + y)
4 │

This function expected 1 argument, but got 2
This function is expected to have 1 argument, but has 2
Loading