Cannot Use a Mirror Summoned via summonExpr #7853
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It looks like it is already fixed on master |
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Okay, thanks. Where can I grab the overnight build and try it out? |
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Wait a minute, are you sure this is working I'm running [error] java.lang.RuntimeException: mirror was an invalid value: <function2>
[error] at derivation.Test$$anon$1.encode(SummonTest.scala:12)
[error] at derivation.Test$$anon$1.encode(SummonTest.scala:12)
[error] at derivation.Test$.main(SummonTest.scala:12)
[error] at derivation.Test.main(SummonTest.scala)
[error] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] at java.lang.reflect.Method.invoke(Method.java:498)
[error] Nonzero exit code: 1 |
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That seems to be another error. Is the code bug free? Is the compiler generating wrong code? Maybe open another issue. |
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I used the same code as found in @liufengyun's posted code here. |
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This line should probably be a compile time error. |
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Oh, it cannot fin the mirror and then defaults to any implicit it finds. That is where the function2 comes from. Maybe just remove that case. |
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That causes: [error] | cannot reduce inline match with
[error] | scrutinee: {
[error] | ev
[error] | } : (ev :
[error] | scala.deriving.Mirror{
[error] | MirroredType = T; MirroredMonoType = T; MirroredElemTypes <: Tuple
[error] | }
[error] | )
[error] | patterns : case m @ _:deriving.Mirror.SumOf[T]
[error] | case m @ _:deriving.Mirror.ProductOf[T]
[error] | This location contains code that was inlined from JsonEncoder.scala:28
[error] -- Error: /home/alexander/git/dotty/mirror_test/src/main/scala/org/deusaquilus/Test.scala:11:57
[error] 11 | println(SummonJsonEncoderTest.encodeAndMessAroundType(stuff) )I'll post the exact code to a repo in a second. |
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Here's the exact code: |
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Please have a look at #7974 |
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minimized code
Let's say I have a simple json encoder, for the sake of example it can be any kind of encoder that uses
derived.Now, inside of a macro, I want to be able to take an abitrary type, summon the mirror for it, and then use the encoder.
Then let's say I use this in some "client-facing" code:
expectation
The above code should work. Instead, it causes the error:
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