Auto merge of #126597 - estebank:unicode-output, r=fmease

Add Unicode block-drawing compiler output support Add nightly-only theming support to rustc output using Unicode box drawing characters instead of ASCII-art to draw the terminal UI. In order to enable, the flags `-Zunstable-options=yes --error-format=human-unicode` must be passed in. After: ``` error: foo ╭▸ test.rs:3:3 │ 3 │ X0 Y0 Z0 │ ┌───╿──│──┘ │ ┌│───│──┘ │ ┏││━━━┙ │ ┃││ 4 │ ┃││ X1 Y1 Z1 5 │ ┃││ X2 Y2 Z2 │ ┃│└────╿──│──┘ `Z` label │ ┃└─────│──┤ │ ┗━━━━━━┥ `Y` is a good letter too │ `X` is a good letter ╰╴ note: bar ╭▸ test.rs:4:3 │ 4 │ ┏ X1 Y1 Z1 5 │ ┃ X2 Y2 Z2 6 │ ┃ X3 Y3 Z3 │ ┗━━━━━━━━━━┛ ├ note: bar ╰ note: baz note: qux ╭▸ test.rs:4:3 │ 4 │ X1 Y1 Z1 ╰╴ ━━━━━━━━ ``` Before: ``` error: foo --> test.rs:3:3 | 3 | X0 Y0 Z0 | ___^__-__- | |___|__| | ||___| | ||| 4 | ||| X1 Y1 Z1 5 | ||| X2 Y2 Z2 | |||____^__-__- `Z` label | ||_____|__| | |______| `Y` is a good letter too | `X` is a good letter | note: bar --> test.rs:4:3 | 4 | / X1 Y1 Z1 5 | | X2 Y2 Z2 6 | | X3 Y3 Z3 | |__________^ = note: bar = note: baz note: qux --> test.rs:4:3 | 4 | X1 Y1 Z1 | ^^^^^^^^ ``` After: ![rustc output with unicode box drawing characters](https://github.com/rust-lang/rust/assets/1606434/d210b79a-6579-4407-9706-ba8edc6e9f25) Before: ![current rustc output with ASCII art](https://github.com/rust-lang/rust/assets/1606434/5aecccf8-a6ee-4469-8b39-72fb0d979a9f)
2024-11-11 00:00:58 +00:00 · 2024-11-11 00:00:58 +00:00 · 42b2496320
commit 42b2496320
parent 143ce0920a acf6344b42
38 changed files with 2278 additions and 231 deletions
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
--- a/compiler/rustc_errors/src/json.rs
+++ b/compiler/rustc_errors/src/json.rs
@ -27,7 +27,7 @@

 use crate::diagnostic::IsLint;
 use crate::emitter::{
-    ColorConfig, Destination, Emitter, HumanEmitter, HumanReadableErrorType,
+    ColorConfig, Destination, Emitter, HumanEmitter, HumanReadableErrorType, OutputTheme,
    should_show_source_code,
 };
 use crate::registry::Registry;
@ -377,6 +377,11 @@ fn reset(&mut self) -> io::Result<()> {
            .terminal_url(je.terminal_url)
            .ui_testing(je.ui_testing)
            .ignored_directories_in_source_blocks(je.ignored_directories_in_source_blocks.clone())
+            .theme(if let HumanReadableErrorType::Unicode = je.json_rendered {
+                OutputTheme::Unicode
+            } else {
+                OutputTheme::Ascii
+            })
            .emit_diagnostic(diag);
        let buf = Arc::try_unwrap(buf.0).unwrap().into_inner().unwrap();
        let buf = String::from_utf8(buf).unwrap();
--- a/compiler/rustc_parse/src/parser/tests.rs
+++ b/compiler/rustc_parse/src/parser/tests.rs
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@ -1721,6 +1721,9 @@ pub fn parse_json(early_dcx: &EarlyDiagCtxt, matches: &getopts::Matches) -> Json
        for sub_option in option.split(',') {
            match sub_option {
                "diagnostic-short" => json_rendered = HumanReadableErrorType::Short,
+                "diagnostic-unicode" => {
+                    json_rendered = HumanReadableErrorType::Unicode;
+                }
                "diagnostic-rendered-ansi" => json_color = ColorConfig::Always,
                "artifacts" => json_artifact_notifications = true,
                "unused-externs" => json_unused_externs = JsonUnusedExterns::Loud,
@ -1767,14 +1770,17 @@ pub fn parse_error_format(
                ErrorOutputType::Json { pretty: true, json_rendered, color_config: json_color }
            }
            Some("short") => ErrorOutputType::HumanReadable(HumanReadableErrorType::Short, color),
+            Some("human-unicode") => {
+                ErrorOutputType::HumanReadable(HumanReadableErrorType::Unicode, color)
+            }
            Some(arg) => {
                early_dcx.abort_if_error_and_set_error_format(ErrorOutputType::HumanReadable(
                    HumanReadableErrorType::Default,
                    color,
                ));
                early_dcx.early_fatal(format!(
-                    "argument for `--error-format` must be `human`, `json` or \
-                     `short` (instead was `{arg}`)"
+                    "argument for `--error-format` must be `human`, `human-annotate-rs`, \
+                    `human-unicode`, `json`, `pretty-json` or `short` (instead was `{arg}`)"
                ))
            }
        }
@ -1827,18 +1833,21 @@ pub fn parse_crate_edition(early_dcx: &EarlyDiagCtxt, matches: &getopts::Matches
 fn check_error_format_stability(
    early_dcx: &EarlyDiagCtxt,
    unstable_opts: &UnstableOptions,
-    error_format: ErrorOutputType,
+    format: ErrorOutputType,
 ) {
-    if !unstable_opts.unstable_options {
-        if let ErrorOutputType::Json { pretty: true, .. } = error_format {
-            early_dcx.early_fatal("`--error-format=pretty-json` is unstable");
-        }
-        if let ErrorOutputType::HumanReadable(HumanReadableErrorType::AnnotateSnippet, _) =
-            error_format
-        {
-            early_dcx.early_fatal("`--error-format=human-annotate-rs` is unstable");
-        }
+    if unstable_opts.unstable_options {
+        return;
    }
+    let format = match format {
+        ErrorOutputType::Json { pretty: true, .. } => "pretty-json",
+        ErrorOutputType::HumanReadable(format, _) => match format {
+            HumanReadableErrorType::AnnotateSnippet => "human-annotate-rs",
+            HumanReadableErrorType::Unicode => "human-unicode",
+            _ => return,
+        },
+        _ => return,
+    };
+    early_dcx.early_fatal(format!("`--error-format={format}` is unstable"))
 }

 fn parse_output_types(
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@ -16,7 +16,9 @@
 };
 use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitter;
 use rustc_errors::codes::*;
-use rustc_errors::emitter::{DynEmitter, HumanEmitter, HumanReadableErrorType, stderr_destination};
+use rustc_errors::emitter::{
+    DynEmitter, HumanEmitter, HumanReadableErrorType, OutputTheme, stderr_destination,
+};
 use rustc_errors::json::JsonEmitter;
 use rustc_errors::registry::Registry;
 use rustc_errors::{
@ -966,6 +968,11 @@ fn default_emitter(
                    .macro_backtrace(macro_backtrace)
                    .track_diagnostics(track_diagnostics)
                    .terminal_url(terminal_url)
+                    .theme(if let HumanReadableErrorType::Unicode = kind {
+                        OutputTheme::Unicode
+                    } else {
+                        OutputTheme::Ascii
+                    })
                    .ignored_directories_in_source_blocks(
                        sopts.unstable_opts.ignore_directory_in_diagnostics_source_blocks.clone(),
                    );
@ -1470,6 +1477,11 @@ fn mk_emitter(output: ErrorOutputType) -> Box<DynEmitter> {
            let short = kind.short();
            Box::new(
                HumanEmitter::new(stderr_destination(color_config), fallback_bundle)
+                    .theme(if let HumanReadableErrorType::Unicode = kind {
+                        OutputTheme::Unicode
+                    } else {
+                        OutputTheme::Ascii
+                    })
                    .short_message(short),
            )
        }
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@ -2223,6 +2223,10 @@ pub fn char_width(ch: char) -> usize {
    }
 }

+pub fn str_width(s: &str) -> usize {
+    s.chars().map(char_width).sum()
+}
+
 /// Normalizes the source code and records the normalizations.
 fn normalize_src(src: &mut String) -> Vec<NormalizedPos> {
    let mut normalized_pos = vec![];
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@ -6,7 +6,9 @@
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::codes::*;
-use rustc_errors::emitter::{DynEmitter, HumanEmitter, stderr_destination};
+use rustc_errors::emitter::{
+    DynEmitter, HumanEmitter, HumanReadableErrorType, OutputTheme, stderr_destination,
+};
 use rustc_errors::json::JsonEmitter;
 use rustc_errors::{ErrorGuaranteed, TerminalUrl};
 use rustc_feature::UnstableFeatures;
@ -154,6 +156,11 @@ pub(crate) fn new_dcx(
                    .teach(unstable_opts.teach)
                    .diagnostic_width(diagnostic_width)
                    .track_diagnostics(unstable_opts.track_diagnostics)
+                    .theme(if let HumanReadableErrorType::Unicode = kind {
+                        OutputTheme::Unicode
+                    } else {
+                        OutputTheme::Ascii
+                    })
                    .ui_testing(unstable_opts.ui_testing),
            )
        }
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@ -15,6 +15,7 @@
 pub(crate) use markdown::test as test_markdown;
 use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
+use rustc_errors::emitter::HumanReadableErrorType;
 use rustc_errors::{ColorConfig, DiagCtxtHandle, ErrorGuaranteed, FatalError};
 use rustc_hir::CRATE_HIR_ID;
 use rustc_hir::def_id::LOCAL_CRATE;
@ -520,10 +521,14 @@ fn run_test(
    });
    if let ErrorOutputType::HumanReadable(kind, color_config) = rustdoc_options.error_format {
        let short = kind.short();
+        let unicode = kind == HumanReadableErrorType::Unicode;

        if short {
            compiler.arg("--error-format").arg("short");
        }
+        if unicode {
+            compiler.arg("--error-format").arg("human-unicode");
+        }

        match color_config {
            ColorConfig::Never => {
--- a/src/tools/clippy/tests/ui/empty_line_after/doc_comments.stderr
+++ b/src/tools/clippy/tests/ui/empty_line_after/doc_comments.stderr
@ -3,7 +3,7 @@ error: empty line after doc comment
   |
 LL | / /// for the crate
 LL | |
-   | |_
+   | |_^
 LL |   fn first_in_crate() {}
   |   ------------------- the comment documents this function
   |
@ -22,7 +22,7 @@ error: empty line after doc comment
   |
 LL | /     /// for the module
 LL | |
-   | |_
+   | |_^
 LL |       fn first_in_module() {}
   |       -------------------- the comment documents this function
   |
@ -39,7 +39,7 @@ error: empty line after doc comment
   |
 LL | /     /// # Indented
 LL | |
-   | |_
+   | |_^
 LL |       /// Blank line
 LL |       fn indented() {}
   |       ------------- the comment documents this function
@ -55,7 +55,7 @@ error: empty line after doc comment
   |
 LL | / /// This should produce a warning
 LL | |
-   | |_
+   | |_^
 LL |   fn with_doc_and_newline() {}
   |   ------------------------- the comment documents this function
   |
@ -69,7 +69,7 @@ LL | |
 LL | | /** This is also a doc comment and is part of the warning
 LL | |  */
 LL | |
-   | |_
+   | |_^
 ...
 LL |   fn three_attributes() {}
   |   --------------------- the comment documents this function
@ -82,7 +82,7 @@ error: empty line after doc comment
 LL | /     /// docs for `old_code`
 LL | |     // fn old_code() {}
 LL | |
-   | |_
+   | |_^
 LL |       fn new_code() {}
   |       ------------- the comment documents this function
   |
@ -102,7 +102,7 @@ LL | |     /// Docs
 LL | |     /// for OldB
 LL | |     // struct OldB;
 LL | |
-   | |_
+   | |_^
 ...
 LL |       struct Multiple;
   |       --------------- the comment documents this struct
@ -125,7 +125,7 @@ LL | /     /**
 LL | |      * Meant to be inner doc comment
 LL | |      */
 LL | |
-   | |_
+   | |_^
 LL |       fn first_in_module() {}
   |       -------------------- the comment documents this function
   |
@ -143,7 +143,7 @@ LL | |      * Docs for `old_code`
 LL | |      */
 LL | |     /* fn old_code() {} */
 LL | |
-   | |_
+   | |_^
 ...
 LL |       fn new_code() {}
   |       ------------- the comment documents this function
@ -161,7 +161,7 @@ error: empty line after doc comment
 LL | /     /// Docs for `old_code2`
 LL | |     /* fn old_code2() {} */
 LL | |
-   | |_
+   | |_^
 LL |       /// Docs for `new_code2`
 LL |       fn new_code2() {}
   |       -------------- the comment documents this function
--- a/src/tools/clippy/tests/ui/empty_line_after/outer_attribute.stderr
+++ b/src/tools/clippy/tests/ui/empty_line_after/outer_attribute.stderr
@ -3,7 +3,7 @@ error: empty line after outer attribute
   |
 LL | / #[crate_type = "lib"]
 LL | |
-   | |_
+   | |_^
 LL |   fn first_in_crate() {}
   |   ------------------- the attribute applies to this function
   |
@ -20,7 +20,7 @@ error: empty line after outer attribute
   |
 LL | / #[inline]
 LL | |
-   | |_
+   | |_^
 LL |   /// some comment
 LL |   fn with_one_newline_and_comment() {}
   |   --------------------------------- the attribute applies to this function
@ -32,7 +32,7 @@ error: empty line after outer attribute
   |
 LL | / #[inline]
 LL | |
-   | |_
+   | |_^
 LL |   fn with_one_newline() {}
   |   --------------------- the attribute applies to this function
   |
@ -44,7 +44,7 @@ error: empty lines after outer attribute
 LL | /     #[crate_type = "lib"]
 LL | |
 LL | |
-   | |_
+   | |_^
 LL |       fn with_two_newlines() {}
   |       ---------------------- the attribute applies to this function
   |
@ -59,7 +59,7 @@ error: empty line after outer attribute
   |
 LL | / #[doc = "doc attributes should be considered attributes"]
 LL | |
-   | |_
+   | |_^
 LL |   enum Baz {
   |   -------- the attribute applies to this enum
   |
@ -70,7 +70,7 @@ error: empty line after outer attribute
   |
 LL | / #[repr(C)]
 LL | |
-   | |_
+   | |_^
 LL |   struct Foo {
   |   ---------- the attribute applies to this struct
   |
@ -81,7 +81,7 @@ error: empty line after outer attribute
   |
 LL | / #[allow(dead_code)]
 LL | |
-   | |_
+   | |_^
 LL |   mod foo {}
   |   ------- the attribute applies to this module
   |
@ -93,7 +93,7 @@ error: empty line after outer attribute
 LL | / #[inline]
 LL | | // Still lint cases where the empty line does not immediately follow the attribute
 LL | |
-   | |_
+   | |_^
 LL |   fn comment_before_empty_line() {}
   |   ------------------------------ the attribute applies to this function
   |
@ -106,7 +106,7 @@ LL | / #[allow(unused)]
 LL | |
 LL | | // This comment is isolated
 LL | |
-   | |_
+   | |_^
 LL |   pub fn isolated_comment() {}
   |   ------------------------- the attribute applies to this function
   |
--- a/src/tools/clippy/tests/ui/four_forward_slashes.stderr
+++ b/src/tools/clippy/tests/ui/four_forward_slashes.stderr
@ -3,7 +3,7 @@ error: this item has comments with 4 forward slashes (`////`). These look like d
   |
 LL | / //// whoops
 LL | | fn a() {}
-   | |_
+   | |_^
   |
   = note: `-D clippy::four-forward-slashes` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::four_forward_slashes)]`
@ -18,7 +18,7 @@ error: this item has comments with 4 forward slashes (`////`). These look like d
 LL | / //// whoops
 LL | | #[allow(dead_code)]
 LL | | fn b() {}
-   | |_
+   | |_^
   |
 help: make this a doc comment by removing one `/`
   |
@ -32,7 +32,7 @@ LL | / //// whoops
 LL | | //// two borked comments!
 LL | | #[track_caller]
 LL | | fn c() {}
-   | |_
+   | |_^
   |
 help: turn these into doc comments by removing one `/`
   |
@ -46,7 +46,7 @@ error: this item has comments with 4 forward slashes (`////`). These look like d
 LL | / //// between attributes
 LL | | #[allow(dead_code)]
 LL | | fn g() {}
-   | |_
+   | |_^
   |
 help: make this a doc comment by removing one `/`
   |
@ -58,7 +58,7 @@ error: this item has comments with 4 forward slashes (`////`). These look like d
   |
 LL | /     //// not very start of contents
 LL | | fn h() {}
-   | |_
+   | |_^
   |
 help: make this a doc comment by removing one `/`
   |
--- a/src/tools/clippy/tests/ui/four_forward_slashes_first_line.stderr
+++ b/src/tools/clippy/tests/ui/four_forward_slashes_first_line.stderr
@ -3,7 +3,7 @@ error: this item has comments with 4 forward slashes (`////`). These look like d
   |
 LL | / //// borked doc comment on the first line. doesn't combust!
 LL | | fn a() {}
-   | |_
+   | |_^
   |
   = note: `-D clippy::four-forward-slashes` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::four_forward_slashes)]`
--- a/src/tools/clippy/tests/ui/too_long_first_doc_paragraph-fix.stderr
+++ b/src/tools/clippy/tests/ui/too_long_first_doc_paragraph-fix.stderr
@ -6,7 +6,7 @@ LL | | /// A much longer explanation that goes into a lot more detail about
 LL | | /// how the thing works, possibly with doclinks and so one,
 LL | | /// and probably spanning a many rows. Blablabla, it needs to be over
 LL | | /// 200 characters so I needed to write something longeeeeeeer.
-   | |_
+   | |_^
   |
   = note: `-D clippy::too-long-first-doc-paragraph` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::too_long_first_doc_paragraph)]`
--- a/src/tools/clippy/tests/ui/too_long_first_doc_paragraph.stderr
+++ b/src/tools/clippy/tests/ui/too_long_first_doc_paragraph.stderr
@ -23,7 +23,7 @@ error: first doc comment paragraph is too long
 LL | / /// Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc turpis nunc, lacinia
 LL | | /// a dolor in, pellentesque aliquet enim. Cras nec maximus sem. Mauris arcu libero,
 LL | | /// gravida non lacinia at, rhoncus eu lacus.
-   | |_
+   | |_^

 error: first doc comment paragraph is too long
  --> tests/ui/too_long_first_doc_paragraph.rs:36:1
@ -32,7 +32,7 @@ LL | / /// Lorem
 LL | | /// ipsum dolor sit amet, consectetur adipiscing elit. Nunc turpis nunc, lacinia
 LL | | /// a dolor in, pellentesque aliquet enim. Cras nec maximus sem. Mauris arcu libero,
 LL | | /// gravida non lacinia at, rhoncus eu lacus.
-   | |_
+   | |_^

 error: aborting due to 3 previous errors

--- a/tests/rustdoc-ui/invalid-syntax.stderr
+++ b/tests/rustdoc-ui/invalid-syntax.stderr
@ -130,7 +130,7 @@ warning: could not parse code block as Rust code
 LL |   ///     \____/
   |  _________^
 LL | | ///
-   | |_
+   | |_^
   |
   = note: error from rustc: unknown start of token: \

--- a/tests/ui/codemap_tests/huge_multispan_highlight.ascii.svg
+++ b/tests/ui/codemap_tests/huge_multispan_highlight.ascii.svg
@ -1,4 +1,4 @@
-<svg width="818px" height="848px" xmlns="http://www.w3.org/2000/svg">
+<svg width="743px" height="848px" xmlns="http://www.w3.org/2000/svg">
  <style>
    .fg { fill: #AAAAAA }
    .bg { background: #000000 }
@ -21,7 +21,7 @@
  <text xml:space="preserve" class="container fg">
    <tspan x="10px" y="28px"><tspan class="fg-ansi256-009 bold">error[E0308]</tspan><tspan class="bold">: `match` arms have incompatible types</tspan>
 </tspan>
-    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold">--&gt; </tspan><tspan>$DIR/huge_multispan_highlight.rs:96:18</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold">--&gt; </tspan><tspan>$DIR/huge_multispan_highlight.rs:99:18</tspan>
 </tspan>
    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
 </tspan>
@ -59,7 +59,7 @@
 </tspan>
    <tspan x="10px" y="370px"><tspan class="fg-ansi256-009 bold">error[E0308]</tspan><tspan class="bold">: `match` arms have incompatible types</tspan>
 </tspan>
-    <tspan x="10px" y="388px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold">--&gt; </tspan><tspan>$DIR/huge_multispan_highlight.rs:213:18</tspan>
+    <tspan x="10px" y="388px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold">--&gt; </tspan><tspan>$DIR/huge_multispan_highlight.rs:216:18</tspan>
 </tspan>
    <tspan x="10px" y="406px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
 </tspan>
--- a/tests/ui/codemap_tests/huge_multispan_highlight.rs
+++ b/tests/ui/codemap_tests/huge_multispan_highlight.rs
@ -1,4 +1,7 @@
-//@ compile-flags: --error-format=human --color=always
+//@ revisions: ascii unicode
+//@ compile-flags: --color=always
+//@[ascii] compile-flags: --error-format=human
+//@[unicode] compile-flags: -Zunstable-options=yes --error-format=human-unicode
 //@ ignore-windows
 fn main() {
    let _ = match true {
--- a/tests/ui/codemap_tests/huge_multispan_highlight.unicode.svg
+++ b/tests/ui/codemap_tests/huge_multispan_highlight.unicode.svg
@ -0,0 +1,116 @@
+<svg width="743px" height="848px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-ansi256-009 { fill: #FF5555 }
+    .fg-ansi256-012 { fill: #5555FF }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-ansi256-009 bold">error[E0308]</tspan><tspan class="bold">: `match` arms have incompatible types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold"> ╭▸ </tspan><tspan>$DIR/huge_multispan_highlight.rs:99:18</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>       let _ = match true {</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>               </tspan><tspan class="fg-ansi256-012 bold">──────────</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">`match` arms have incompatible types</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>           true =&gt; (</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">┌─────────────────┘</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>             // last line shown in multispan header</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">‡</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="208px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>         ),</tspan>
+</tspan>
+    <tspan x="10px" y="226px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">└─────────┘</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">this is found to be of type `()`</tspan>
+</tspan>
+    <tspan x="10px" y="244px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>           false =&gt; "</tspan>
+</tspan>
+    <tspan x="10px" y="262px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┏━━━━━━━━━━━━━━━━━━┛</tspan>
+</tspan>
+    <tspan x="10px" y="280px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">‡</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan>
+</tspan>
+    <tspan x="10px" y="298px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan>
+</tspan>
+    <tspan x="10px" y="316px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan><tspan>         ",</tspan>
+</tspan>
+    <tspan x="10px" y="334px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">╰╴</tspan><tspan class="fg-ansi256-009 bold">┗━━━━━━━━━┛</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">expected `()`, found `&amp;str`</tspan>
+</tspan>
+    <tspan x="10px" y="352px">
+</tspan>
+    <tspan x="10px" y="370px"><tspan class="fg-ansi256-009 bold">error[E0308]</tspan><tspan class="bold">: `match` arms have incompatible types</tspan>
+</tspan>
+    <tspan x="10px" y="388px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold"> ╭▸ </tspan><tspan>$DIR/huge_multispan_highlight.rs:216:18</tspan>
+</tspan>
+    <tspan x="10px" y="406px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="424px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>       let _ = match true {</tspan>
+</tspan>
+    <tspan x="10px" y="442px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>               </tspan><tspan class="fg-ansi256-012 bold">──────────</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">`match` arms have incompatible types</tspan>
+</tspan>
+    <tspan x="10px" y="460px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>           true =&gt; (</tspan>
+</tspan>
+    <tspan x="10px" y="478px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">┌─────────────────┘</tspan>
+</tspan>
+    <tspan x="10px" y="496px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="514px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>         1 // last line shown in multispan header</tspan>
+</tspan>
+    <tspan x="10px" y="532px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">‡</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="550px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="568px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>         ),</tspan>
+</tspan>
+    <tspan x="10px" y="586px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">└─────────┘</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">this is found to be of type `{integer}`</tspan>
+</tspan>
+    <tspan x="10px" y="604px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>           false =&gt; "</tspan>
+</tspan>
+    <tspan x="10px" y="622px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┏━━━━━━━━━━━━━━━━━━┛</tspan>
+</tspan>
+    <tspan x="10px" y="640px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan>
+</tspan>
+    <tspan x="10px" y="658px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan>
+</tspan>
+    <tspan x="10px" y="676px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan><tspan>         1 last line shown in multispan</tspan>
+</tspan>
+    <tspan x="10px" y="694px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">‡</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan>
+</tspan>
+    <tspan x="10px" y="712px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan>
+</tspan>
+    <tspan x="10px" y="730px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">┃</tspan><tspan>         ",</tspan>
+</tspan>
+    <tspan x="10px" y="748px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">╰╴</tspan><tspan class="fg-ansi256-009 bold">┗━━━━━━━━━┛</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">expected integer, found `&amp;str`</tspan>
+</tspan>
+    <tspan x="10px" y="766px">
+</tspan>
+    <tspan x="10px" y="784px"><tspan class="fg-ansi256-009 bold">error</tspan><tspan class="bold">: aborting due to 2 previous errors</tspan>
+</tspan>
+    <tspan x="10px" y="802px">
+</tspan>
+    <tspan x="10px" y="820px"><tspan class="bold">For more information about this error, try `rustc --explain E0308`.</tspan>
+</tspan>
+    <tspan x="10px" y="838px">
+</tspan>
+  </text>
+
+</svg>
--- a/tests/ui/diagnostic-width/E0271.ascii.stderr
+++ b/tests/ui/diagnostic-width/E0271.ascii.stderr
@ -1,5 +1,5 @@
 error[E0271]: type mismatch resolving `<Result<Result<(), Result<Result<(), Result<Result<(), Option<{integer}>>, ...>>, ...>>, ...> as Future>::Error == Foo`
-  --> $DIR/E0271.rs:18:5
+  --> $DIR/E0271.rs:20:5
   |
 LL | /     Box::new(
 LL | |         Ok::<_, ()>(
@ -11,7 +11,7 @@ LL | |     )
   | |_____^ type mismatch resolving `<Result<Result<(), Result<Result<(), ...>, ...>>, ...> as Future>::Error == Foo`
   |
 note: expected this to be `Foo`
-  --> $DIR/E0271.rs:8:18
+  --> $DIR/E0271.rs:10:18
   |
 LL |     type Error = E;
   |                  ^
--- a/tests/ui/diagnostic-width/E0271.rs
+++ b/tests/ui/diagnostic-width/E0271.rs
@ -1,4 +1,6 @@
-//@ compile-flags: --diagnostic-width=40
+//@ revisions: ascii unicode
+//@[ascii] compile-flags: --diagnostic-width=40
+//@[unicode] compile-flags: -Zunstable-options=yes --error-format=human-unicode --diagnostic-width=40
 //@ normalize-stderr-test: "long-type-\d+" -> "long-type-hash"
 trait Future {
    type Error;
@ -15,7 +17,7 @@ impl<T> Future for Option<T> {
 struct Foo;

 fn foo() -> Box<dyn Future<Error=Foo>> {
-    Box::new( //~ ERROR E0271
+    Box::new( //[ascii]~ ERROR E0271
        Ok::<_, ()>(
            Err::<(), _>(
                Ok::<_, ()>(
--- a/tests/ui/diagnostic-width/E0271.unicode.stderr
+++ b/tests/ui/diagnostic-width/E0271.unicode.stderr
@ -0,0 +1,22 @@
+error[E0271]: type mismatch resolving `<Result<Result<(), Result<Result<(), Result<Result<(), Option<{integer}>>, ...>>, ...>>, ...> as Future>::Error == Foo`
+   ╭▸ $DIR/E0271.rs:20:5
+   │
+LL │ ┏     Box::new(
+LL │ ┃         Ok::<_, ()>(
+LL │ ┃             Err::<(), _>(
+LL │ ┃                 Ok::<_, ()>(
+   ‡ ┃
+LL │ ┃         )
+LL │ ┃     )
+   │ ┗━━━━━┛ type mismatch resolving `<Result<Result<(), Result<Result<(), ...>, ...>>, ...> as Future>::Error == Foo`
+   ╰╴
+note: expected this to be `Foo`
+   ╭▸ $DIR/E0271.rs:10:18
+   │
+LL │     type Error = E;
+   │                  ━
+   ╰ note: required for the cast from `Box<Result<Result<(), Result<Result<(), Result<Result<(), Option<{integer}>>, ()>>, ()>>, ()>>` to `Box<(dyn Future<Error = Foo> + 'static)>`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0271`.
--- a/tests/ui/diagnostic-width/flag-human.ascii.stderr
+++ b/tests/ui/diagnostic-width/flag-human.ascii.stderr
@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/flag-human.rs:7:17
+  --> $DIR/flag-human.rs:9:17
   |
 LL | ..._: () = 42;
   |       --   ^^ expected `()`, found integer
--- a/tests/ui/diagnostic-width/flag-human.rs
+++ b/tests/ui/diagnostic-width/flag-human.rs
@ -1,9 +1,11 @@
-//@ compile-flags: --diagnostic-width=20
+//@ revisions: ascii unicode
+//@[ascii] compile-flags: --diagnostic-width=20
+//@[unicode] compile-flags: -Zunstable-options=yes --error-format=human-unicode --diagnostic-width=20

 // This test checks that `-Z output-width` effects the human error output by restricting it to an
 // arbitrarily low value so that the effect is visible.

 fn main() {
    let _: () = 42;
-    //~^ ERROR mismatched types
+    //[ascii]~^ ERROR mismatched types
 }
--- a/tests/ui/diagnostic-width/flag-human.unicode.stderr
+++ b/tests/ui/diagnostic-width/flag-human.unicode.stderr
@ -0,0 +1,11 @@
+error[E0308]: mismatched types
+   ╭▸ $DIR/flag-human.rs:9:17
+   │
+LL │ …t _: () = 42;
+   │       ┬─   ━━ expected `()`, found integer
+   │       │
+   ╰╴      expected due to this
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
--- a/tests/ui/diagnostic-width/long-E0308.ascii.stderr
+++ b/tests/ui/diagnostic-width/long-E0308.ascii.stderr
@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/long-E0308.rs:44:9
+  --> $DIR/long-E0308.rs:46:9
   |
 LL |        let x: Atype<
   |  _____________-
@ -20,11 +20,11 @@ LL |  |     ))))))))))))))))))))))))))))));
   |
   = note: expected struct `Atype<Btype<..., ...>, ...>`
                found enum `Result<Result<..., ...>, ...>`
-   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308/long-E0308.long-type-hash.txt'
+   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.ascii/long-E0308.long-type-hash.txt'
   = note: consider using `--verbose` to print the full type name to the console

 error[E0308]: mismatched types
-  --> $DIR/long-E0308.rs:57:26
+  --> $DIR/long-E0308.rs:59:26
   |
 LL |       ))))))))))))))))) == Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(O...
   |  __________________________^
@ -36,11 +36,11 @@ LL | |     ))))))))))))))))))))))));
   |
   = note: expected enum `Option<Result<..., ...>>`
              found enum `Result<Result<..., ...>, ...>`
-   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308/long-E0308.long-type-hash.txt'
+   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.ascii/long-E0308.long-type-hash.txt'
   = note: consider using `--verbose` to print the full type name to the console

 error[E0308]: mismatched types
-  --> $DIR/long-E0308.rs:88:9
+  --> $DIR/long-E0308.rs:90:9
   |
 LL |       let x: Atype<
   |  ____________-
@ -56,11 +56,11 @@ LL | |     > = ();
   |
   = note: expected struct `Atype<Btype<..., ...>, ...>`
           found unit type `()`
-   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308/long-E0308.long-type-hash.txt'
+   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.ascii/long-E0308.long-type-hash.txt'
   = note: consider using `--verbose` to print the full type name to the console

 error[E0308]: mismatched types
-  --> $DIR/long-E0308.rs:91:17
+  --> $DIR/long-E0308.rs:93:17
   |
 LL |       let _: () = Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(O...
   |  ____________--___^
@ -74,7 +74,7 @@ LL | |     ))))))))))))))))))))))));
   |
   = note: expected unit type `()`
                   found enum `Result<Result<..., ...>, ...>`
-   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308/long-E0308.long-type-hash.txt'
+   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.ascii/long-E0308.long-type-hash.txt'
   = note: consider using `--verbose` to print the full type name to the console

 error: aborting due to 4 previous errors
--- a/tests/ui/diagnostic-width/long-E0308.rs
+++ b/tests/ui/diagnostic-width/long-E0308.rs
@ -1,4 +1,6 @@
-//@ compile-flags: --diagnostic-width=60 -Zwrite-long-types-to-disk=yes
+//@ revisions: ascii unicode
+//@[ascii] compile-flags: --diagnostic-width=60 -Zwrite-long-types-to-disk=yes
+//@[unicode] compile-flags: -Zunstable-options=yes --json=diagnostic-unicode --diagnostic-width=60 -Zwrite-long-types-to-disk=yes
 //@ normalize-stderr-test: "long-type-\d+" -> "long-type-hash"

 mod a {
--- a/tests/ui/diagnostic-width/long-E0308.unicode.stderr
+++ b/tests/ui/diagnostic-width/long-E0308.unicode.stderr
@ -0,0 +1,82 @@
+error[E0308]: mismatched types
+   ╭▸ $DIR/long-E0308.rs:46:9
+   │
+LL │        let x: Atype<
+   │ ┌─────────────┘
+LL │ │        Btype<
+LL │ │          Ctype<
+LL │ │            Atype<
+   ‡ │
+LL │ │        i32
+LL │ │      > = Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(O…
+   │ │┏━━━━━│━━━┛
+   │ └┃─────┤
+   │  ┃     expected due to this
+LL │  ┃         Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(O…
+LL │  ┃             Ok("")
+LL │  ┃         ))))))))))))))))))))))))))))))
+LL │  ┃     ))))))))))))))))))))))))))))));
+   │  ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ expected `Atype<Btype<..., ...>, ...>`, found `Result<Result<..., ...>, ...>`
+   │
+   ├ note: expected struct `Atype<Btype<..., ...>, ...>`
+   │            found enum `Result<Result<..., ...>, ...>`
+   ├ note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.unicode/long-E0308.long-type-hash.txt'
+   ╰ note: consider using `--verbose` to print the full type name to the console
+
+error[E0308]: mismatched types
+   ╭▸ $DIR/long-E0308.rs:59:26
+   │
+LL │       ))))))))))))))))) == Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(…
+   │ ┏━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+LL │ ┃         Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok…
+LL │ ┃             Ok(Ok(Ok(Ok(Ok(Ok(Ok("")))))))
+LL │ ┃         ))))))))))))))))))))))))))))))
+LL │ ┃     ))))))))))))))))))))))));
+   │ ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ expected `Option<Result<..., ...>>`, found `Result<Result<..., ...>, ...>`
+   │
+   ├ note: expected enum `Option<Result<..., ...>>`
+   │          found enum `Result<Result<..., ...>, ...>`
+   ├ note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.unicode/long-E0308.long-type-hash.txt'
+   ╰ note: consider using `--verbose` to print the full type name to the console
+
+error[E0308]: mismatched types
+   ╭▸ $DIR/long-E0308.rs:90:9
+   │
+LL │       let x: Atype<
+   │ ┌────────────┘
+LL │ │       Btype<
+LL │ │         Ctype<
+LL │ │           Atype<
+   ‡ │
+LL │ │       i32
+LL │ │     > = ();
+   │ │     │   ━━ expected `Atype<Btype<..., ...>, ...>`, found `()`
+   │ └─────┤
+   │       expected due to this
+   │
+   ├ note: expected struct `Atype<Btype<..., ...>, ...>`
+   │       found unit type `()`
+   ├ note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.unicode/long-E0308.long-type-hash.txt'
+   ╰ note: consider using `--verbose` to print the full type name to the console
+
+error[E0308]: mismatched types
+   ╭▸ $DIR/long-E0308.rs:93:17
+   │
+LL │       let _: () = Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(…
+   │ ┏━━━━━━━━━━━━┬─━━━┛
+   │ ┃            │
+   │ ┃            expected due to this
+LL │ ┃         Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok(Ok…
+LL │ ┃             Ok(Ok(Ok(Ok(Ok(Ok(Ok("")))))))
+LL │ ┃         ))))))))))))))))))))))))))))))
+LL │ ┃     ))))))))))))))))))))))));
+   │ ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ expected `()`, found `Result<Result<..., ...>, ...>`
+   │
+   ├ note: expected unit type `()`
+   │               found enum `Result<Result<..., ...>, ...>`
+   ├ note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/long-E0308.unicode/long-E0308.long-type-hash.txt'
+   ╰ note: consider using `--verbose` to print the full type name to the console
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
--- a/tests/ui/diagnostic-width/non-1-width-unicode-multiline-label.ascii.stderr
+++ b/tests/ui/diagnostic-width/non-1-width-unicode-multiline-label.ascii.stderr
@ -1,5 +1,5 @@
 error[E0369]: cannot add `&str` to `&str`
-  --> $DIR/non-1-width-unicode-multiline-label.rs:5:260
+  --> $DIR/non-1-width-unicode-multiline-label.rs:7:260
   |
 LL | ...ཽཾཿ྄ཱྀྀྂྃ྅྆྇ྈྉྊྋྌྍྎྏྐྑྒྒྷྔྕྖྗ྘ྙྚྛྜྜྷྞྟྠྡྡྷྣྤྥྦྦྷྨྩྪྫྫྷྭྮྯྰྱྲླྴྵྶྷྸྐྵྺྻྼ྽྾྿࿀࿁࿂࿃࿄࿅࿆࿇...࿋࿌࿍࿎࿏࿐࿑࿒࿓࿔࿕࿖࿗࿘࿙࿚"; let _a = unicode_is_fun + " really fun!";
   |                                                  -------------- ^ -------------- &str
--- a/tests/ui/diagnostic-width/non-1-width-unicode-multiline-label.rs
+++ b/tests/ui/diagnostic-width/non-1-width-unicode-multiline-label.rs
@ -1,7 +1,9 @@
+//@ revisions: ascii unicode
+//@[unicode] compile-flags: -Zunstable-options=yes --error-format=human-unicode
 // ignore-tidy-linelength

 fn main() {
    let unicode_is_fun = "؁‱ஹ௸௵꧄.ဪ꧅⸻𒈙𒐫﷽𒌄𒈟𒍼𒁎𒀱𒌧𒅃 𒈓𒍙𒊎𒄡𒅌𒁏𒀰𒐪𒐩𒈙𒐫𪚥";
    let _ = "ༀ༁༂༃༄༅༆༇༈༉༊་༌།༎༏༐༑༒༓༔༕༖༗༘༙༚༛༜༝༞༟༠༡༢༣༤༥༦༧༨༩༪༫༬༭༮༯༰༱༲༳༴༵༶༷༸༹༺༻༼༽༾༿ཀཁགགྷངཅཆཇ཈ཉཊཋཌཌྷཎཏཐདདྷནཔཕབབྷམཙཚཛཛྷཝཞཟའཡརལཤཥསཧཨཀྵཪཫཬ཭཮཯཰ཱཱཱིིུུྲྀཷླྀཹེཻོཽཾཿ྄ཱྀྀྂྃ྅྆྇ྈྉྊྋྌྍྎྏྐྑྒྒྷྔྕྖྗ྘ྙྚྛྜྜྷྞྟྠྡྡྷྣྤྥྦྦྷྨྩྪྫྫྷྭྮྯྰྱྲླྴྵྶྷྸྐྵྺྻྼ྽྾྿࿀࿁࿂࿃࿄࿅࿆࿇࿈࿉࿊࿋࿌࿍࿎࿏࿐࿑࿒࿓࿔࿕࿖࿗࿘࿙࿚"; let _a = unicode_is_fun + " really fun!";
-    //~^ ERROR cannot add `&str` to `&str`
+    //[ascii]~^ ERROR cannot add `&str` to `&str`
 }
--- a/tests/ui/diagnostic-width/non-1-width-unicode-multiline-label.unicode.stderr
+++ b/tests/ui/diagnostic-width/non-1-width-unicode-multiline-label.unicode.stderr
@ -0,0 +1,18 @@
+error[E0369]: cannot add `&str` to `&str`
+   ╭▸ $DIR/non-1-width-unicode-multiline-label.rs:7:260
+   │
+LL │ …ཻོཽཾཿ྄ཱྀྀྂྃ྅྆྇ྈྉྊྋྌྍྎྏྐྑྒྒྷྔྕྖྗ྘ྙྚྛྜྜྷྞྟྠྡྡྷྣྤྥྦྦྷྨྩྪྫྫྷྭྮྯྰྱྲླྴྵྶྷྸྐྵྺྻྼ྽྾྿࿀࿁࿂࿃࿄࿅࿆࿇࿈࿉…࿋࿌࿍࿎࿏࿐࿑࿒࿓࿔࿕࿖࿗࿘࿙࿚"; let _a = unicode_is_fun + " really fun!";
+   │                                                  ┬───────────── ┯ ────────────── &str
+   │                                                  │              │
+   │                                                  │              `+` cannot be used to concatenate two `&str` strings
+   │                                                  &str
+   │
+   ╰ note: string concatenation requires an owned `String` on the left
+help: create an owned `String` from a string reference
+   ╭╴
+LL │     let _ = "ༀ༁༂༃༄༅༆༇༈༉༊་༌།༎༏༐༑༒༓༔༕༖༗༘༙༚༛༜༝༞༟༠༡༢༣༤༥༦༧༨༩༪༫༬༭༮༯༰༱༲༳༴༵༶༷༸༹༺༻༼༽༾༿ཀཁགགྷངཅཆཇ཈ཉཊཋཌཌྷཎཏཐདདྷནཔཕབབྷམཙཚཛཛྷཝཞཟའཡརལཤཥསཧཨཀྵཪཫཬ཭཮཯཰ཱཱཱིིུུྲྀཷླྀཹེཻོཽཾཿ྄ཱྀྀྂྃ྅྆྇ྈྉྊྋྌྍྎྏྐྑྒྒྷྔྕྖྗ྘ྙྚྛྜྜྷྞྟྠྡྡྷྣྤྥྦྦྷྨྩྪྫྫྷྭྮྯྰྱྲླྴྵྶྷྸྐྵྺྻྼ྽྾྿࿀࿁࿂࿃࿄࿅࿆࿇࿈࿉࿊࿋࿌࿍࿎࿏࿐࿑࿒࿓࿔࿕࿖࿗࿘࿙࿚"; let _a = unicode_is_fun.to_owned() + " really fun!";
+   ╰╴                                                                                                                                                                                        +++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0369`.
--- a/tests/ui/diagnostic-width/non-whitespace-trimming-2.ascii.stderr
+++ b/tests/ui/diagnostic-width/non-whitespace-trimming-2.ascii.stderr
@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/non-whitespace-trimming-2.rs:4:311
+  --> $DIR/non-whitespace-trimming-2.rs:6:311
   |
 LL | ...13; let _: usize = 14; let _: usize = 15; let _: () = 42; let _: usize = 0; let _: usize = 1; let _: usize = 2; let _: usize = 3; let ...
   |                                                     --   ^^ expected `()`, found integer
--- a/tests/ui/diagnostic-width/non-whitespace-trimming-2.rs
+++ b/tests/ui/diagnostic-width/non-whitespace-trimming-2.rs
@ -1,6 +1,8 @@
+//@ revisions: ascii unicode
+//@[unicode] compile-flags: -Zunstable-options=yes --error-format=human-unicode
 // ignore-tidy-linelength

 fn main() {
    let _: usize = 0; let _: usize = 1; let _: usize = 2; let _: usize = 3; let _: usize = 4; let _: usize = 5; let _: usize = 6; let _: usize = 7; let _: usize = 8; let _: usize = 9; let _: usize = 10; let _: usize = 11; let _: usize = 12; let _: usize = 13; let _: usize = 14; let _: usize = 15; let _: () = 42; let _: usize = 0; let _: usize = 1; let _: usize = 2; let _: usize = 3; let _: usize = 4; let _: usize = 5; let _: usize = 6; let _: usize = 7; let _: usize = 8; let _: usize = 9; let _: usize = 10; let _: usize = 11; let _: usize = 12; let _: usize = 13; let _: usize = 14; let _: usize = 15;
-//~^ ERROR mismatched types
+//[ascii]~^ ERROR mismatched types
 }
--- a/tests/ui/diagnostic-width/non-whitespace-trimming-2.unicode.stderr
+++ b/tests/ui/diagnostic-width/non-whitespace-trimming-2.unicode.stderr
@ -0,0 +1,11 @@
+error[E0308]: mismatched types
+   ╭▸ $DIR/non-whitespace-trimming-2.rs:6:311
+   │
+LL │ …= 13; let _: usize = 14; let _: usize = 15; let _: () = 42; let _: usize = 0; let _: usize = 1; let _: usize = 2; let _: usize = 3; let _:…
+   │                                                     ┬─   ━━ expected `()`, found integer
+   │                                                     │
+   ╰╴                                                    expected due to this
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
--- a/tests/ui/error-emitter/unicode-output.rs
+++ b/tests/ui/error-emitter/unicode-output.rs
@ -0,0 +1,21 @@
+//@ compile-flags: -Zunstable-options=yes --error-format=human-unicode --color=always
+//@ edition:2018
+//@ only-linux
+
+use core::pin::Pin;
+use core::future::Future;
+use core::any::Any;
+
+fn query(_: fn(Box<(dyn Any + Send + '_)>) -> Pin<Box<(
+    dyn Future<Output = Result<Box<(dyn Any + 'static)>, String>> + Send + 'static
+)>>) {}
+
+fn wrapped_fn<'a>(_: Box<(dyn Any + Send)>) -> Pin<Box<(
+    dyn Future<Output = Result<Box<(dyn Any + 'static)>, String>> + Send + 'static
+)>> {
+    Box::pin(async { Err("nope".into()) })
+}
+
+fn main() {
+    query(wrapped_fn);
+}
--- a/tests/ui/error-emitter/unicode-output.svg
+++ b/tests/ui/error-emitter/unicode-output.svg
@ -0,0 +1,72 @@
+<svg width="785px" height="434px" xmlns="http://www.w3.org/2000/svg">
+  <style>
+    .fg { fill: #AAAAAA }
+    .bg { background: #000000 }
+    .fg-ansi256-009 { fill: #FF5555 }
+    .fg-ansi256-010 { fill: #55FF55 }
+    .fg-ansi256-012 { fill: #5555FF }
+    .fg-magenta { fill: #AA00AA }
+    .container {
+      padding: 0 10px;
+      line-height: 18px;
+    }
+    .bold { font-weight: bold; }
+    tspan {
+      font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+      white-space: pre;
+      line-height: 18px;
+    }
+  </style>
+
+  <rect width="100%" height="100%" y="0" rx="4.5" class="bg" />
+
+  <text xml:space="preserve" class="container fg">
+    <tspan x="10px" y="28px"><tspan class="fg-ansi256-009 bold">error[E0308]</tspan><tspan class="bold">: mismatched types</tspan>
+</tspan>
+    <tspan x="10px" y="46px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold"> ╭▸ </tspan><tspan>$DIR/unicode-output.rs:20:11</tspan>
+</tspan>
+    <tspan x="10px" y="64px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="82px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>     query(wrapped_fn);</tspan>
+</tspan>
+    <tspan x="10px" y="100px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>     </tspan><tspan class="fg-ansi256-012 bold">┬────</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">━━━━━━━━━━</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">one type is more general than the other</tspan>
+</tspan>
+    <tspan x="10px" y="118px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>     </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="136px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>     </tspan><tspan class="fg-ansi256-012 bold">arguments to this function are incorrect</tspan>
+</tspan>
+    <tspan x="10px" y="154px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="172px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">╰ </tspan><tspan class="bold">note</tspan><tspan>: expected fn pointer `</tspan><tspan class="fg-magenta bold">for&lt;'a&gt; </tspan><tspan>fn(Box&lt;</tspan><tspan class="fg-magenta bold">(dyn Any + Send + 'a)</tspan><tspan>&gt;) -&gt; Pin&lt;_&gt;`</tspan>
+</tspan>
+    <tspan x="10px" y="190px"><tspan>                 found fn item `fn(Box&lt;</tspan><tspan class="fg-magenta bold">(dyn Any + Send + 'static)</tspan><tspan>&gt;) -&gt; Pin&lt;_&gt; {wrapped_fn}`</tspan>
+</tspan>
+    <tspan x="10px" y="208px"><tspan class="fg-ansi256-010 bold">note</tspan><tspan>: function defined here</tspan>
+</tspan>
+    <tspan x="10px" y="226px"><tspan>  </tspan><tspan class="fg-ansi256-012 bold"> ╭▸ </tspan><tspan>$DIR/unicode-output.rs:9:4</tspan>
+</tspan>
+    <tspan x="10px" y="244px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan>
+</tspan>
+    <tspan x="10px" y="262px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>   fn query(_: fn(Box&lt;(dyn Any + Send + '_)&gt;) -&gt; Pin&lt;Box&lt;(</tspan>
+</tspan>
+    <tspan x="10px" y="280px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">┌────</tspan><tspan class="fg-ansi256-010 bold">━━━━━</tspan><tspan class="fg-ansi256-012 bold">─┘</tspan>
+</tspan>
+    <tspan x="10px" y="298px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan>     dyn Future&lt;Output = Result&lt;Box&lt;(dyn Any + 'static)&gt;, String&gt;&gt; + Send + 'static</tspan>
+</tspan>
+    <tspan x="10px" y="316px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">│</tspan><tspan> )&gt;&gt;) {}</tspan>
+</tspan>
+    <tspan x="10px" y="334px"><tspan>   </tspan><tspan class="fg-ansi256-012 bold">╰╴</tspan><tspan class="fg-ansi256-012 bold">└───┘</tspan>
+</tspan>
+    <tspan x="10px" y="352px">
+</tspan>
+    <tspan x="10px" y="370px"><tspan class="fg-ansi256-009 bold">error</tspan><tspan class="bold">: aborting due to 1 previous error</tspan>
+</tspan>
+    <tspan x="10px" y="388px">
+</tspan>
+    <tspan x="10px" y="406px"><tspan class="bold">For more information about this error, try `rustc --explain E0308`.</tspan>
+</tspan>
+    <tspan x="10px" y="424px">
+</tspan>
+  </text>
+
+</svg>
--- a/tests/ui/parser/bad-char-literals.stderr
+++ b/tests/ui/parser/bad-char-literals.stderr
@ -15,7 +15,7 @@ error: character constant must be escaped: `\n`
 LL |       '
   |  ______^
 LL | | ';
-   | |_
+   | |_^
   |
 help: escape the character
   |