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compiler crashes on play master #6367

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scabug opened this issue Sep 12, 2012 · 4 comments
Closed

compiler crashes on play master #6367

scabug opened this issue Sep 12, 2012 · 4 comments
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@scabug scabug commented Sep 12, 2012

the following file is crashing the compiler:

https://github.com/playframework/Play20/blob/master/framework/src/play/src/main/scala/play/api/libs/json/Util.scala

stack trace:

[elided]

I deleted the stack trace because it's all spurious; the only relevant information is "OutOfMemoryError".

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@scabug scabug commented Sep 12, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6367?orig=1
Reporter: peter hausel (phausel)
Affected Versions: 2.10.0-M7
Other Milestones: 2.10.0

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@scabug scabug commented Sep 12, 2012

@paulp said:
Something has gone exponential in type inference.

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@scabug scabug commented Sep 12, 2012

@paulp said:
The exponent is applied during type parameter inference. If you wish to work around:

// All the expressions which look like this
def ~[A21](m3:M[A21]) = new CanBuild21(canBuild(m1,m2),m3)
// Should instead be generated like this
def ~[A21](m3:M[A21]) = new CanBuild21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21](canBuild(m1,m2),m3)

Then the problem will go away.

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@scabug scabug commented Sep 12, 2012

@scabug scabug closed this Sep 13, 2012
@scabug scabug added the backend label Apr 7, 2017
@scabug scabug added this to the 2.10.0-M7 milestone Apr 7, 2017
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