don't elide shared parts of types in diagnostics when --verbose is passed

this also changes some parts of lifetime printing, which previously were not gated behind `-Z verbose`

Author: jyn514

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1189,7 +1189,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
 
         fn fmt_region<'tcx>(region: ty::Region<'tcx>) -> String {
             let mut r = region.to_string();
-            if r == "'_" {
+            if r == "'_" && !self.tcx.sess.options.verbose {
                 r.clear();
             } else {
                 r.push(' ');
@@ -1302,7 +1302,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                         if lifetimes.0 != lifetimes.1 {
                             values.0.push_highlighted(l1);
                             values.1.push_highlighted(l2);
-                        } else if lifetimes.0.is_bound() {
+                        } else if lifetimes.0.is_bound() || self.tcx.sess.options.verbose {
                             values.0.push_normal(l1);
                             values.1.push_normal(l2);
                         } else {
@@ -1323,7 +1323,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                     let num_display_types = consts_offset - regions_len;
                     for (i, (ta1, ta2)) in type_arguments.take(num_display_types).enumerate() {
                         let i = i + regions_len;
-                        if ta1 == ta2 && !self.tcx.sess.verbose_internals() {
+                        if ta1 == ta2 && !self.tcx.sess.opts.verbose {
                             values.0.push_normal("_");
                             values.1.push_normal("_");
                         } else {
@@ -1337,7 +1337,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                     let const_arguments = sub1.consts().zip(sub2.consts());
                     for (i, (ca1, ca2)) in const_arguments.enumerate() {
                         let i = i + consts_offset;
-                        if ca1 == ca2 && !self.tcx.sess.verbose_internals() {
+                        if ca1 == ca2 && !self.tcx.sess.opts.verbose {
                             values.0.push_normal("_");
                             values.1.push_normal("_");
                         } else {
@@ -1507,7 +1507,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             (ty::FnPtr(sig1), ty::FnPtr(sig2)) => self.cmp_fn_sig(sig1, sig2),
 
             _ => {
-                if t1 == t2 && !self.tcx.sess.verbose_internals() {
+                if t1 == t2 && !self.tcx.sess.opts.verbose {
                     // The two types are the same, elide and don't highlight.
                     (DiagnosticStyledString::normal("_"), DiagnosticStyledString::normal("_"))
                 } else {

compiler/rustc_session/src/config.rs

@@ -1116,6 +1116,7 @@ impl Default for Options {
             working_dir: RealFileName::LocalPath(std::env::current_dir().unwrap()),
             color: ColorConfig::Auto,
             logical_env: FxIndexMap::default(),
+            verbose: false,
         }
     }
 }
@@ -2916,6 +2917,8 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
         RealFileName::LocalPath(path.into_owned())
     };
 
+    let verbose = matches.opt_present("verbose") || unstable_opts.verbose_internals;
+
     Options {
         assert_incr_state,
         crate_types,
@@ -2957,6 +2960,7 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
         working_dir,
         color,
         logical_env,
+        verbose,
     }
 }
 

compiler/rustc_session/src/options.rs

@@ -223,6 +223,8 @@ top_level_options!(
         /// The (potentially remapped) working directory
         working_dir: RealFileName [TRACKED],
         color: ColorConfig [UNTRACKED],
+
+        verbose: bool [UNTRACKED],
     }
 );