fix: remove doubled ? in missing-argument hint - #6137
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This was referenced Aug 4, 2026
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When a function value is used where a value was expected, the compiler adds a hint built from
format!("Argument might be missing {to_what}?"). The named branch producesto_what = "to function std.group", which reads correctly. The fallback branch — used when the function type carries no name hint — already ended in?, so the two combined into a doubled??:Dropping the
?from the fallback string leaves the one supplied by theformat!. No existing snapshot covered this branch, so a test is added alongside the fix. Found during the nightly survey ofprqlc/prqlc/src/semantic/resolver/.