Add forward compat tests for macros

Author: nicolasstucki

tests/pos-macros/forwardCompat-3.0/Macro_1_c3.0.0.scala

@@ -0,0 +1,20 @@
+import scala.quoted.*
+
+object Macros:
+
+  inline def power(x: Double, inline n: Int) = ${ powerCode('x, 'n) }
+
+  private def powerCode(x: Expr[Double], n: Expr[Int])(using Quotes): Expr[Double] =
+    unrolledPowerCode(x, n.valueOrError)
+
+  private def unrolledPowerCode(x: Expr[Double], n: Int)(using Quotes): Expr[Double] =
+    if n == 0 then '{ 1.0 } // tests simple quotes without splices
+    else if n % 2 == 1 then '{ $x * ${ unrolledPowerCode(x, n - 1) } } // tests simple splices
+    else '{ val y = $x * $x; ${ unrolledPowerCode('y, n / 2) } } // tests splice with term capture
+
+
+  inline def let[T, U](x: T)(inline body: T => U): U = ${ letCode('x, 'body) }
+
+  private def letCode[T: Type, U: Type](x: Expr[T], body: Expr[T => U])(using Quotes): Expr[U] =
+    // tests use of Type
+    '{ val y: T = $x; $body(y): U }

tests/pos-macros/forwardCompat-3.0/Test_2.scala

@@ -0,0 +1,15 @@
+import Macros.*
+
+def powerTest(x: Double): Unit =
+  power(x, 0)
+  power(x, 1)
+  power(x, 5)
+  power(x, 10)
+
+def letTest: Unit =
+  let(0) { _ + 1 }
+  let(0) { _.toString }
+  let((4, 'a')) { _.swap }
+  let(new Foo) { _.hashCode }
+
+class Foo

tests/pos-macros/forwardCompat-3.1/Macro_1_c3.1.0.scala

@@ -0,0 +1,20 @@
+import scala.quoted.*
+
+object Macros:
+
+  inline def power(x: Double, inline n: Int) = ${ powerCode('x, 'n) }
+
+  private def powerCode(x: Expr[Double], n: Expr[Int])(using Quotes): Expr[Double] =
+    unrolledPowerCode(x, n.valueOrError)
+
+  private def unrolledPowerCode(x: Expr[Double], n: Int)(using Quotes): Expr[Double] =
+    if n == 0 then '{ 1.0 } // tests simple quotes without splices
+    else if n % 2 == 1 then '{ $x * ${ unrolledPowerCode(x, n - 1) } } // tests simple splices
+    else '{ val y = $x * $x; ${ unrolledPowerCode('y, n / 2) } } // tests splice with term capture
+
+
+  inline def let[T, U](x: T)(inline body: T => U): U = ${ letCode('x, 'body) }
+
+  private def letCode[T: Type, U: Type](x: Expr[T], body: Expr[T => U])(using Quotes): Expr[U] =
+    // tests use of Type
+    '{ val y: T = $x; $body(y): U }

tests/pos-macros/forwardCompat-3.1/Test_2.scala

@@ -0,0 +1,15 @@
+import Macros.*
+
+def powerTest(x: Double): Unit =
+  power(x, 0)
+  power(x, 1)
+  power(x, 5)
+  power(x, 10)
+
+def letTest: Unit =
+  let(0) { _ + 1 }
+  let(0) { _.toString }
+  let((4, 'a')) { _.swap }
+  let(new Foo) { _.hashCode }
+
+class Foo