Add a pass-by-copy parameter passing convention

This is intended to solve the problem of how to pass arguments to
constructor functions -- you want to move in rvalues, but not have to
explicitly copy stuff that is not an rvalue. The by-copy passing
convention will ensure the callee gets its own copy of the value. For
rvalues, it'll just pass off the value. For lvalues, it'll make a
copy.

Issue #1177

1 files changed, 8 insertions, 0 deletions

diff --git a/src/test/run-pass/pass-by-copy.rs b/src/test/run-pass/pass-by-copy.rs
new file mode 100644
index 00000000000..61cdd01ba21
--- /dev/null
+++ b/src/test/run-pass/pass-by-copy.rs
@@ -0,0 +1,8 @@
+fn magic(+x: {a: @int}) { log x; }
+fn magic2(+x: @int) { log x; }
+
+fn main() {
+    let a = {a: @10}, b = @10;
+    magic(a); magic({a: @20});
+    magic2(b); magic2(@20);
+}