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SI-7296 Avoid crash with nested 23-param case class

The implementation restriction doesn't stop subsequent
typechecking in the same compilation unit from triggering
type completion which tries to synthesize the unapply
method.

This commit predicates generation of the unapply method
on having 22 or fewer parameters.
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commit ad79d74deef6e624aa7048543207ec97810f07f5 1 parent 1187c98
@retronym retronym authored
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4 src/compiler/scala/tools/nsc/typechecker/Namers.scala
@@ -1373,7 +1373,9 @@ trait Namers extends MethodSynthesis {
if (!cdef.symbol.hasAbstractFlag)
namer.enterSyntheticSym(caseModuleApplyMeth(cdef))
- namer.enterSyntheticSym(caseModuleUnapplyMeth(cdef))
+ val primaryConstructorArity = treeInfo.firstConstructorArgs(cdef.impl.body).size
+ if (primaryConstructorArity <= MaxTupleArity)
+ namer.enterSyntheticSym(caseModuleUnapplyMeth(cdef))
}
def addCopyMethod(cdef: ClassDef, namer: Namer) {
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4 test/files/neg/t7296.check
@@ -0,0 +1,4 @@
+t7296.scala:5: error: Implementation restriction: case classes cannot have more than 22 parameters.
+ case class Foo(a: A, b: A, c: A, d: A, e: A, f: A, g: A, h: A, i: A, j: A, k: A, l: A, m: A, n: A, o: A, p: A, q: A, r: A, s: A, t: A, u: A, v: A, w: A, x: A, y: A, Z: A)
+ ^
+one error found
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6 test/files/neg/t7296.scala
@@ -0,0 +1,6 @@
+object Test {
+ type A = Int
+ // Emits the implementation restriction but then proceeds to crash
+ // when creating the Foo.unapply.
+ case class Foo(a: A, b: A, c: A, d: A, e: A, f: A, g: A, h: A, i: A, j: A, k: A, l: A, m: A, n: A, o: A, p: A, q: A, r: A, s: A, t: A, u: A, v: A, w: A, x: A, y: A, Z: A)
+}
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