fix(#19402): error message for missing using in given params #19496
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`given`-s can't have non-implicit arguments, but when users forget
adding a `using` modifier to given parameters, it showed unfriendly error
message; "only classes can have declared but undefined members".
The `termParamClauses` parser is aware of the owner of parameters and it raises
a syntax error when parameters in given definition do not have `using` modifier with clear reason,
but `in.token == LPAREN && in.lookahead.isIdent(nme.using)` in
Parsers.scala was too strict to delegate parameter clause handling to `termParamClauses`.
Note:
This change requires tests/neg/i8150.check to be updated because the original
test starts failing due to the syntax error rather than "refinement cannot be `given`" error.
`type T = {given A with A}` in i8150.check confirms that a valid given definition
in RHS of type alias still raises the original error; "refinement cannot be `given`" error.
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This will clash with the proposed syntax changes for type classes, which would make the change unnecessary. I therefore like to put this on hold until the fate of these syntax changes is decided. |
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The syntax changes are now all stabilized. So @i10416, if you want to pick this up again, now it's all clear. |
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Thank you for reminder! |
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close #19402
given-s can't have non-implicit arguments, but when users forget adding ausingmodifier to given parameters, it showed unfriendly error message; "only classes can have declared but undefined members".The
termParamClausesparser is aware of the owner of parameters and it raises a syntax error when parameters in given definition do not haveusingmodifier with clear reason, but the conditionin.token == LPAREN && in.lookahead.isIdent(nme.using)in Parsers.scala was too strict to delegate parameter clause handling totermParamClauses.Note:
This change requires tests/neg/i8150.check to be updated because the original test starts failing due to the syntax error rather than "refinement cannot be
given" error.type T = {given A with A}in i8150.check confirms that a valid given definition in RHS of type alias still raises the original error; "refinement cannot begiven" error.