1 files changed, 40 insertions, 0 deletions
diff --git a/src/test/ui/diagnostic-width/flag-json.stderr b/src/test/ui/diagnostic-width/flag-json.stderr
new file mode 100644
index 000000000..b21391d16
--- /dev/null
+++ b/src/test/ui/diagnostic-width/flag-json.stderr
@@ -0,0 +1,40 @@
+{"message":"mismatched types","code":{"code":"E0308","explanation":"Expected type did not match the received type.
+
+Erroneous code examples:
+
+```compile_fail,E0308
+fn plus_one(x: i32) -> i32 {
+    x + 1
+}
+
+plus_one(\"Not a number\");
+//       ^^^^^^^^^^^^^^ expected `i32`, found `&str`
+
+if \"Not a bool\" {
+// ^^^^^^^^^^^^ expected `bool`, found `&str`
+}
+
+let x: f32 = \"Not a float\";
+//     ---   ^^^^^^^^^^^^^ expected `f32`, found `&str`
+//     |
+//     expected due to this
+```
+
+This error occurs when an expression was used in a place where the compiler
+expected an expression of a different type. It can occur in several cases, the
+most common being when calling a function and passing an argument which has a
+different type than the matching type in the function declaration.
+"},"level":"error","spans":[{"file_name":"$DIR/flag-json.rs","byte_start":243,"byte_end":245,"line_start":7,"line_end":7,"column_start":17,"column_end":19,"is_primary":true,"text":[{"text":"    let _: () = 42;","highlight_start":17,"highlight_end":19}],"label":"expected `()`, found integer","suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"$DIR/flag-json.rs","byte_start":238,"byte_end":240,"line_start":7,"line_end":7,"column_start":12,"column_end":14,"is_primary":false,"text":[{"text":"    let _: () = 42;","highlight_start":12,"highlight_end":14}],"label":"expected due to this","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"error[E0308]: mismatched types
+  --> $DIR/flag-json.rs:7:17
+   |
+LL | ..._: () = 42;
+   |       --   ^^ expected `()`, found integer
+   |       |
+   |       expected due to this
+
+"}
+{"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error
+
+"}
+{"message":"For more information about this error, try `rustc --explain E0308`.","code":null,"level":"failure-note","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0308`.
+"}