diff --git a/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.fixed b/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.fixed
new file mode 100644
index 00000000000..64ab6f62b77
--- /dev/null
+++ b/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.fixed
@@ -0,0 +1,8 @@
+// run-rustfix
+
+fn main() {
+    const _FOO: i32 = 123;
+    //~^ ERROR const` and `let` are mutually exclusive
+    const _BAR: i32 = 123;
+    //~^ ERROR `const` and `let` are mutually exclusive
+}
diff --git a/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.rs b/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.rs
new file mode 100644
index 00000000000..50520971ffb
--- /dev/null
+++ b/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.rs
@@ -0,0 +1,8 @@
+// run-rustfix
+
+fn main() {
+    const let _FOO: i32 = 123;
+    //~^ ERROR const` and `let` are mutually exclusive
+    let const _BAR: i32 = 123;
+    //~^ ERROR `const` and `let` are mutually exclusive
+}
diff --git a/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.stderr b/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.stderr
new file mode 100644
index 00000000000..72377fc379c
--- /dev/null
+++ b/src/test/ui/parser/issue-99910-const-let-mutually-exclusive.stderr
@@ -0,0 +1,14 @@
+error: `const` and `let` are mutually exclusive
+  --> $DIR/issue-99910-const-let-mutually-exclusive.rs:4:5
+   |
+LL |     const let _FOO: i32 = 123;
+   |     ^^^^^^^^^ help: remove `let`: `const`
+
+error: `const` and `let` are mutually exclusive
+  --> $DIR/issue-99910-const-let-mutually-exclusive.rs:6:5
+   |
+LL |     let const _BAR: i32 = 123;
+   |     ^^^^^^^^^ help: remove `let`: `const`
+
+error: aborting due to 2 previous errors
+