1 files changed, 51 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs b/src/test/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs
new file mode 100644
index 000000000..e12e07a28
--- /dev/null
+++ b/src/test/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs
@@ -0,0 +1,51 @@
+fn foo<const C: usize>() {}
+
+const BAR: usize = 42;
+
+fn a() {
+    foo::<BAR + 3>(); //~ ERROR expected one of
+}
+fn b() {
+    // FIXME(const_generics): these diagnostics are awful, because trait objects without `dyn` were
+    // a terrible mistake.
+    foo::<BAR + BAR>();
+    //~^ ERROR expected trait, found constant `BAR`
+    //~| ERROR expected trait, found constant `BAR`
+    //~| ERROR type provided when a constant was expected
+}
+fn c() {
+    foo::<3 + 3>(); //~ ERROR expressions must be enclosed in braces
+}
+fn d() {
+    foo::<BAR - 3>(); //~ ERROR expected one of
+}
+fn e() {
+    foo::<BAR - BAR>(); //~ ERROR expected one of
+}
+fn f() {
+    foo::<100 - BAR>(); //~ ERROR expressions must be enclosed in braces
+}
+fn g() {
+    foo::<bar<i32>()>(); //~ ERROR expected one of
+}
+fn h() {
+    foo::<bar::<i32>()>(); //~ ERROR expected one of
+}
+fn i() {
+    foo::<bar::<i32>() + BAR>(); //~ ERROR expected one of
+}
+fn j() {
+    foo::<bar::<i32>() - BAR>(); //~ ERROR expected one of
+}
+fn k() {
+    foo::<BAR - bar::<i32>()>(); //~ ERROR expected one of
+}
+fn l() {
+    foo::<BAR - bar::<i32>()>(); //~ ERROR expected one of
+}
+
+const fn bar<const C: usize>() -> usize {
+    C
+}
+
+fn main() {}