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Improve opIndex/opSlice error messages (#20791)

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Dennis 2025-01-28 11:44:46 +01:00 • committed by GitHub
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6 changed files with 95 additions and 29 deletions
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changelog/dmd.error-messages.dd
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@ -30,12 +30,26 @@ Error: `app.bar` called with argument types `(string)` matches multiple overload
*/
---
When there's no operator overload found for a type, a new supplemental message points to the declaration.
When there's no index / slice operator overload found for a type, a new supplemental message suggests where to implement it.
---
struct S {}
void main()
{
S s;
const x = s[3 .. "4"];
}
/*
app.d(8): Error: no `[]` operator overload for type `U`
app.d(6): `app.U` declared here
Before:
app.d(6): Error: no `[]` operator overload for type `S`
After:
app.d(6): Error: no `[3.."4"]` operator overload for type `S`
app.d(1): perhaps define `auto opSlice(int lower, string upper) {}` for `app.S`
*/
---