Auto merge of #66671 - matthewjasper:ast-address-of, r=Centril

Ast address-of

This is the parts of #64588 that don't affect MIR. If an address-of expression makes it to MIR lowering we error and lower to the best currently expressible approximation to limit further errors.

r? @Centril

1 files changed, 20 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0745.md b/src/librustc_error_codes/error_codes/E0745.md
new file mode 100644
index 00000000000..7c478a1e0c8
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0745.md
@@ -0,0 +1,20 @@
+Cannot take address of temporary value.
+
+Erroneous code example:
+
+```compile_fail,E0745
+# #![feature(raw_ref_op)]
+fn temp_address() {
+    let ptr = &raw const 2;   // ERROR
+}
+```
+
+To avoid the error, first bind the temporary to a named local variable.
+
+```ignore
+# #![feature(raw_ref_op)]
+fn temp_address() {
+    let val = 2;
+    let ptr = &raw const val;
+}
+```