Improve unclear error and warning messages - #8460

Merged

JonoPrest merged 30 commits into

rescript-lang:masterfrom

JonoPrest:jono/improve-error-messages

Jun 4, 2026

Commits on Jun 4, 2026

Improve non-function application error wording
JonoPrest
committed
eaa08ac
Improve @return(*_to_opt) error message
JonoPrest
committed
ea4f1aa
Improve @int variant @as payload error message
JonoPrest
committed
924df9f
Improve conflicting-attributes error message
JonoPrest
committed
98e2ced
Render @ correctly in FFI attribute error messages
JonoPrest
committed
9941a5c
Improve @this simple-pattern error message
JonoPrest
committed
d4d6fe3
Tidy the "expected a string literal" error message
JonoPrest
committed
0d86cba
Tidy the @as int/string/json literal error message
JonoPrest
committed
ada53da
Tighten @this and @return wording for accuracy
JonoPrest
committed
ddb077c
Fix subject-verb agreement in type-params-not-supported error
JonoPrest
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0ae8105
Fix list grammar in @as variant annotation error
JonoPrest
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25e71c3
Use ReScript-style quoting for `let rec` in letrec errors
JonoPrest
committed
2834153
Drop OCaml-manual references from warning messages
JonoPrest
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9863419
Improve duplicate @as annotation error wording
JonoPrest
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9f649e2
Improve duplicate @deriving attribute error wording
JonoPrest
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2c756dc
Improve unsupported @return directive error message
JonoPrest
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5097a90
Make duplicate @as message context-neutral
JonoPrest
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478c552
Report the real attribute name in misplaced @inline warning
JonoPrest
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93d326a
Use @-prefixed attribute names in attribute warnings
JonoPrest
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ef95ef9
Name the conflicting attributes in the conflict error
JonoPrest
committed
0bd1528
Use 'switch' instead of OCaml ''match' expression' in no-value-clauses error
JonoPrest
committed
df62d4c
Say 'pattern' instead of OCaml 'matching' in multiply-bound-variable error
JonoPrest
committed
efe7c2f
Clarify the fragile-pattern-in-toplevel error wording
JonoPrest
committed
d15fc11
State the rule in the invalid type-variable-name error
JonoPrest
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ef9c443
Fix pluralization and phrasing in type-arity-mismatch error
JonoPrest
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c001778
Clarify packed-module / GADT-pattern / existential error messages
JonoPrest
committed
b7f5c45
Backtick the type-constructor name in type-arity-mismatch error
JonoPrest
committed
8670c1e
Add changelog entry for error/warning message improvements
JonoPrest
committed
c2cffb9
Capitalize two lowercase error messages for consistency
JonoPrest
committed
fa243b1
Cover new error-message branches flagged by codecov
JonoPrest
committed
76fd535

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Improve unclear error and warning messages - #8460

Improve unclear error and warning messages#8460
JonoPrest merged 30 commits into
rescript-lang:masterfrom
JonoPrest:jono/improve-error-messages

Commits on Jun 4, 2026

Improve non-function application error wording

Improve @return(*_to_opt) error message

Improve @int variant @as payload error message

Improve conflicting-attributes error message

Render @ correctly in FFI attribute error messages

Improve @this simple-pattern error message

Tidy the "expected a string literal" error message

Tidy the @as int/string/json literal error message

Tighten @this and @return wording for accuracy

Fix subject-verb agreement in type-params-not-supported error

Fix list grammar in @as variant annotation error

Use ReScript-style quoting for `let rec` in letrec errors

Drop OCaml-manual references from warning messages

Improve duplicate @as annotation error wording

Improve duplicate @deriving attribute error wording

Improve unsupported @return directive error message

Make duplicate @as message context-neutral

Report the real attribute name in misplaced @inline warning

Use @-prefixed attribute names in attribute warnings

Name the conflicting attributes in the conflict error

Use 'switch' instead of OCaml ''match' expression' in no-value-clauses error

Say 'pattern' instead of OCaml 'matching' in multiply-bound-variable error

Clarify the fragile-pattern-in-toplevel error wording

State the rule in the invalid type-variable-name error

Fix pluralization and phrasing in type-arity-mismatch error

Clarify packed-module / GADT-pattern / existential error messages

Backtick the type-constructor name in type-arity-mismatch error

Add changelog entry for error/warning message improvements

Capitalize two lowercase error messages for consistency

Cover new error-message branches flagged by codecov