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Add beta-reduction regression test #11113

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Jan 13, 2021
Merged

Add beta-reduction regression test #11113

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33 changes: 33 additions & 0 deletions compiler/test/dotty/tools/backend/jvm/InlineBytecodeTests.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -582,4 +582,37 @@ class InlineBytecodeTests extends DottyBytecodeTest {

}
}

@Test def i9456 = {
val source = """class Foo {
| def test: Int = inline2(inline1(2.+))
|
| inline def inline1(inline f: Int => Int): Int => Int = i => f(1)
|
| inline def inline2(inline f: Int => Int): Int = f(2) + 3
|}
""".stripMargin

checkBCode(source) { dir =>
val clsIn = dir.lookupName("Foo.class", directory = false).input
val clsNode = loadClassNode(clsIn)

val fun = getMethod(clsNode, "test")
val instructions = instructionsFromMethod(fun)
val expected = // TODO room for constant folding
List(
Op(ICONST_1),
VarOp(ISTORE, 1),
Op(ICONST_2),
VarOp(ILOAD, 1),
Op(IADD),
Op(ICONST_3),
Op(IADD),
Op(IRETURN),
)
assert(instructions == expected,
"`f` was not properly inlined in `fun`\n" + diffInstructions(instructions, expected))

}
}
}