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add preliminary support for generic code
Note that we don't yet support reporting unused parameters on generic functions, as showed by the TODO in typeparams.txt, but at least we don't panic as quickly as before. Also note that running unparam on std currently panics as well, presumably due to a bug in go/ssa that I will report shortly. Thanks to Ainar Garipov for reporting and Ludovic Fernandez for suggesting a fix. Fixes #62.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| # TODO: catch unusedGeneric. | ||
| unparam . | ||
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| -- stdout.golden -- | ||
| -- go.mod -- | ||
| module testdata.tld/foo | ||
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| go 1.18 | ||
| -- foo.go -- | ||
| package foo | ||
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| var DoWork func() | ||
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| func GenericFunc[GenericParamA, B any](x GenericParamA, y B) {} | ||
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| type GenericVector[GenericParamT any] []GenericParamT | ||
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| type GenericGraph[T any] struct { | ||
| Content T | ||
| Edges []GenericGraph[T] | ||
| } | ||
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| type PredeclaredSignedInteger interface { | ||
| int | int8 | int16 | int32 | int64 | ||
| } | ||
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| type StringableSignedInteger interface { | ||
| ~int | ~int8 | ~int16 | ~int32 | ~int64 | ||
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| String() string | ||
| } | ||
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| type CombineEmbeds interface { | ||
| string | int | ||
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| interface { EmbeddedMethod() } | ||
| RegularMethod() | ||
| } | ||
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| type Tuple[T1 any, T2 any] struct { | ||
| left T1 | ||
| right T2 | ||
| } | ||
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| func (t Tuple[T1, T2]) Left() T1 { return t.left } | ||
| func (t Tuple[T1, T2]) Right() T2 { return t.right } | ||
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| func (t Tuple[T1, T2]) unusedGeneric(t1 T1, t2 T2) T2 { | ||
| DoWork() | ||
| return t2 | ||
| } | ||
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| // otherwise Tuple isn't reachable. | ||
| var Sink interface{} = new(Tuple[int, string]) |