Rollup merge of rust-lang#60513 - chrisvittal:remove-borrowck-compare, r=matthewjasper

Remove -Z borrowck=compare flag

This is the start of the work that needs to be done on rust-lang#59193. It just removes the flag and updates
the tests.

r? @matthewjasper

Author: Centril

src/librustc/infer/mod.rs

@@ -97,9 +97,8 @@ impl SuppressRegionErrors {
             // If we're on Migrate mode, report AST region errors
             BorrowckMode::Migrate => SuppressRegionErrors { suppressed: false },
 
-            // If we're on MIR or Compare mode, don't report AST region errors as they should
-            // be reported by NLL
-            BorrowckMode::Compare | BorrowckMode::Mir => SuppressRegionErrors { suppressed: true },
+            // If we're on MIR, don't report AST region errors as they should be reported by NLL
+            BorrowckMode::Mir => SuppressRegionErrors { suppressed: true },
         }
     }
 }

src/librustc/session/config.rs

@@ -462,7 +462,6 @@ pub enum PrintRequest {
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum BorrowckMode {
     Mir,
-    Compare,
     Migrate,
 }
 
@@ -471,7 +470,6 @@ impl BorrowckMode {
     /// on the AST borrow check if the MIR-based one errors.
     pub fn migrate(self) -> bool {
         match self {
-            BorrowckMode::Compare => false,
             BorrowckMode::Mir => false,
             BorrowckMode::Migrate => true,
         }
@@ -480,7 +478,6 @@ impl BorrowckMode {
     /// Should we emit the AST-based borrow checker errors?
     pub fn use_ast(self) -> bool {
         match self {
-            BorrowckMode::Compare => true,
             BorrowckMode::Mir => false,
             BorrowckMode::Migrate => false,
         }
@@ -1214,7 +1211,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     identify_regions: bool = (false, parse_bool, [UNTRACKED],
         "make unnamed regions display as '# (where # is some non-ident unique id)"),
     borrowck: Option<String> = (None, parse_opt_string, [UNTRACKED],
-        "select which borrowck is used (`ast`, `mir`, `migrate`, or `compare`)"),
+        "select which borrowck is used (`mir` or `migrate`)"),
     time_passes: bool = (false, parse_bool, [UNTRACKED],
         "measure time of each rustc pass"),
     time: bool = (false, parse_bool, [UNTRACKED],
@@ -2315,7 +2312,6 @@ pub fn build_session_options_and_crate_config(
     let borrowck_mode = match debugging_opts.borrowck.as_ref().map(|s| &s[..]) {
         None | Some("migrate") => BorrowckMode::Migrate,
         Some("mir") => BorrowckMode::Mir,
-        Some("compare") => BorrowckMode::Compare,
         Some(m) => early_error(error_format, &format!("unknown borrowck mode `{}`", m)),
     };
 

src/librustc_mir/util/borrowck_errors.rs

@@ -12,26 +12,10 @@ pub enum Origin {
 }
 
 impl fmt::Display for Origin {
-    fn fmt(&self, w: &mut fmt::Formatter<'_>) -> fmt::Result {
-        // If the user passed `-Z borrowck=compare`, then include
-        // origin info as part of the error report,
-        // otherwise
-        let display_origin = ty::tls::with_opt(|opt_tcx| {
-            if let Some(tcx) = opt_tcx {
-                tcx.sess.opts.borrowck_mode == BorrowckMode::Compare
-            } else {
-                false
-            }
-        });
-        if display_origin {
-            match *self {
-                Origin::Mir => write!(w, " (Mir)"),
-                Origin::Ast => write!(w, " (Ast)"),
-            }
-        } else {
-            // Print no origin info
-            Ok(())
-        }
+    fn fmt(&self, _w: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // FIXME(chrisvittal) remove Origin entirely
+        // Print no origin info
+        Ok(())
     }
 }
 

src/test/run-pass/binding/match-pipe-binding.rs

@@ -1,5 +1,4 @@
 // run-pass
-// compile-flags: -Z borrowck=compare
 
 fn test1() {
     // from issue 6338

src/test/run-pass/issues/issue-16671.rs

@@ -1,5 +1,4 @@
 // run-pass
-//compile-flags: -Z borrowck=compare
 
 #![deny(warnings)]
 

src/test/run-pass/issues/issue-49955.rs

@@ -1,5 +1,4 @@
 // run-pass
-// compile-flags: -Z borrowck=compare
 
 const ALL_THE_NUMS: [u32; 1] = [
     1

src/test/run-pass/issues/issue-8860.rs

@@ -1,6 +1,5 @@
 // run-pass
 #![allow(dead_code)]
-// compile-flags: -Z borrowck=compare
 
 static mut DROP: isize = 0;
 static mut DROP_S: isize = 0;

src/test/run-pass/numbers-arithmetic/i128.rs

@@ -3,7 +3,6 @@
 
 // ignore-emscripten i128 doesn't work
 
-// compile-flags: -Z borrowck=compare
 
 #![feature(test)]
 

src/test/run-pass/numbers-arithmetic/u128.rs

@@ -1,7 +1,6 @@
 // run-pass
 // ignore-emscripten u128 not supported
 
-// compile-flags: -Z borrowck=compare
 
 #![feature(test)]
 

src/test/run-pass/weird-exprs.rs

@@ -2,7 +2,6 @@
 #![allow(dead_code)]
 #![allow(unreachable_code)]
 #![allow(unused_parens)]
-// compile-flags: -Z borrowck=compare
 
 #![recursion_limit = "256"]