Auto merge of #99780 - Nilstrieb:mir-opt-test-line-no, r=oli-obk

Use line numbers relative to the function in mir-opt tests

As shown in #99770, the line numbers can be a big source of needless and confusing diffs. This PR adds a new flag `-Zmir-pretty-relative-line-numbers` to make them relative to the function declaration, which avoids most needless diffs from attribute changes.

`@JakobDegen` told me that there has been a zulip conversation about disabling line numbers with mixed opinions, so I'd like to get some feedback here, for this hopefully better solution.

r? rust-lang/wg-mir-opt

1 files changed, 12 insertions, 12 deletions

diff --git a/src/test/mir-opt/remove_unneeded_drops.opt.RemoveUnneededDrops.diff b/src/test/mir-opt/remove_unneeded_drops.opt.RemoveUnneededDrops.diff
index 44eda308bdf..b29b08f836d 100644
--- a/src/test/mir-opt/remove_unneeded_drops.opt.RemoveUnneededDrops.diff
+++ b/src/test/mir-opt/remove_unneeded_drops.opt.RemoveUnneededDrops.diff
@@ -2,30 +2,30 @@
 + // MIR for `opt` after RemoveUnneededDrops
   
   fn opt(_1: bool) -> () {
-      debug x => _1;                       // in scope 0 at $DIR/remove_unneeded_drops.rs:3:8: 3:9
-      let mut _0: ();                      // return place in scope 0 at $DIR/remove_unneeded_drops.rs:3:17: 3:17
-      let _2: ();                          // in scope 0 at $DIR/remove_unneeded_drops.rs:4:5: 4:12
-      let mut _3: bool;                    // in scope 0 at $DIR/remove_unneeded_drops.rs:4:10: 4:11
+      debug x => _1;                       // in scope 0 at $DIR/remove_unneeded_drops.rs:+0:8: +0:9
+      let mut _0: ();                      // return place in scope 0 at $DIR/remove_unneeded_drops.rs:+0:17: +0:17
+      let _2: ();                          // in scope 0 at $DIR/remove_unneeded_drops.rs:+1:5: +1:12
+      let mut _3: bool;                    // in scope 0 at $DIR/remove_unneeded_drops.rs:+1:10: +1:11
       scope 1 (inlined std::mem::drop::<bool>) { // at $DIR/remove_unneeded_drops.rs:4:5: 4:12
           debug _x => _3;                  // in scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL
       }
   
       bb0: {
-          StorageLive(_2);                 // scope 0 at $DIR/remove_unneeded_drops.rs:4:5: 4:12
-          StorageLive(_3);                 // scope 0 at $DIR/remove_unneeded_drops.rs:4:10: 4:11
-          _3 = _1;                         // scope 0 at $DIR/remove_unneeded_drops.rs:4:10: 4:11
+          StorageLive(_2);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:5: +1:12
+          StorageLive(_3);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:10: +1:11
+          _3 = _1;                         // scope 0 at $DIR/remove_unneeded_drops.rs:+1:10: +1:11
 -         drop(_3) -> bb1;                 // scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL
 -     }
 - 
 -     bb1: {
-          StorageDead(_3);                 // scope 0 at $DIR/remove_unneeded_drops.rs:4:11: 4:12
-          StorageDead(_2);                 // scope 0 at $DIR/remove_unneeded_drops.rs:4:12: 4:13
--         nop;                             // scope 0 at $DIR/remove_unneeded_drops.rs:3:17: 5:2
-          return;                          // scope 0 at $DIR/remove_unneeded_drops.rs:5:2: 5:2
+          StorageDead(_3);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:11: +1:12
+          StorageDead(_2);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:12: +1:13
+-         nop;                             // scope 0 at $DIR/remove_unneeded_drops.rs:+0:17: +2:2
+          return;                          // scope 0 at $DIR/remove_unneeded_drops.rs:+2:2: +2:2
 -     }
 - 
 -     bb2 (cleanup): {
--         resume;                          // scope 0 at $DIR/remove_unneeded_drops.rs:3:1: 5:2
+-         resume;                          // scope 0 at $DIR/remove_unneeded_drops.rs:+0:1: +2:2
       }
   }