diff --git a/src/test/ui/const-generics/min_const_generics/default_function_param.rs b/src/test/ui/const-generics/min_const_generics/default_function_param.rs
new file mode 100644
index 00000000000..7e0c1c2ed9f
--- /dev/null
+++ b/src/test/ui/const-generics/min_const_generics/default_function_param.rs
@@ -0,0 +1,6 @@
+#![feature(min_const_generics)]
+
+fn foo<const SIZE: usize = 5>() {}
+                      //~^ ERROR expected one of `!`, `(`, `+`, `,`, `::`, `<`, or `>`, found `=`
+
+fn main() {}
diff --git a/src/test/ui/const-generics/min_const_generics/default_function_param.stderr b/src/test/ui/const-generics/min_const_generics/default_function_param.stderr
new file mode 100644
index 00000000000..ed1a83b6a4d
--- /dev/null
+++ b/src/test/ui/const-generics/min_const_generics/default_function_param.stderr
@@ -0,0 +1,8 @@
+error: expected one of `!`, `(`, `+`, `,`, `::`, `<`, or `>`, found `=`
+  --> $DIR/default_function_param.rs:3:26
+   |
+LL | fn foo<const SIZE: usize = 5>() {}
+   |                          ^ expected one of 7 possible tokens
+
+error: aborting due to previous error
+
diff --git a/src/test/ui/const-generics/min_const_generics/default_trait_param.rs b/src/test/ui/const-generics/min_const_generics/default_trait_param.rs
new file mode 100644
index 00000000000..322ddccbf18
--- /dev/null
+++ b/src/test/ui/const-generics/min_const_generics/default_trait_param.rs
@@ -0,0 +1,6 @@
+#![feature(min_const_generics)]
+
+trait Foo<const KIND: bool = true> {}
+                        //~^ ERROR expected one of `!`, `(`, `+`, `,`, `::`, `<`, or `>`, found `=`
+
+fn main() {}
diff --git a/src/test/ui/const-generics/min_const_generics/default_trait_param.stderr b/src/test/ui/const-generics/min_const_generics/default_trait_param.stderr
new file mode 100644
index 00000000000..49c3ac86744
--- /dev/null
+++ b/src/test/ui/const-generics/min_const_generics/default_trait_param.stderr
@@ -0,0 +1,8 @@
+error: expected one of `!`, `(`, `+`, `,`, `::`, `<`, or `>`, found `=`
+  --> $DIR/default_trait_param.rs:3:28
+   |
+LL | trait Foo<const KIND: bool = true> {}
+   |                            ^ expected one of 7 possible tokens
+
+error: aborting due to previous error
+