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Add note of separate compilation unit in macro's code example #4541

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May 22, 2018
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Add note of separate compilation unit in macro's code example #4541

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9 changes: 6 additions & 3 deletions docs/docs/reference/principled-meta-programming.md
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Original file line number Diff line number Diff line change
Expand Up @@ -322,9 +322,12 @@ program that calls `assert`.
'{ if !(~expr) then throw new AssertionError(s"failed assertion: ${~expr}") }
}

val program = {
val x = 1
Macros.assert(x != 0)
// has to be in a different compilation unit that depends on Macros
object App {
val program = {
val x = 1
Macros.assert(x != 0)
}
}

Inlining the `assert` function would give the following program:
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