Implement out-qualified target syntax for setting target-specific vars

So now we can do:

doc{INSTALL}@./: install = false

Note that so far that's the only place where we support out-qualification.
Grep for @@ OUT to see other places.

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/target/out-qualified/src/buildfile b/tests/target/out-qualified/src/buildfile
new file mode 100644
index 0000000..1bcaa32
--- /dev/null
+++ b/tests/target/out-qualified/src/buildfile
@@ -0,0 +1,5 @@
+./: file{foo}
+
+# Use --verbose 6 to debug.
+#
+file{foo}@./: x = y