diff --git a/src/test/ui/const-generics/macro_rules-braces.full.stderr b/src/test/ui/const-generics/macro_rules-braces.full.stderr
index f6e9aabd90774..e5b67f61a25b7 100644
--- a/src/test/ui/const-generics/macro_rules-braces.full.stderr
+++ b/src/test/ui/const-generics/macro_rules-braces.full.stderr
@@ -9,6 +9,17 @@ help: enclose the `const` expression in braces
 LL |     let _: baz!({ N });
    |                 ^   ^
 
+error: expressions must be enclosed in braces to be used as const generic arguments
+  --> $DIR/macro_rules-braces.rs:54:17
+   |
+LL |     let _: baz!(10 + 7);
+   |                 ^^^^^^
+   |
+help: enclose the `const` expression in braces
+   |
+LL |     let _: baz!({ 10 + 7 });
+   |                 ^        ^
+
 error: constant expression depends on a generic parameter
   --> $DIR/macro_rules-braces.rs:10:13
    |
@@ -57,5 +68,5 @@ LL |     let _: biz!({ N });
    = note: this may fail depending on what value the parameter takes
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to 5 previous errors
+error: aborting due to 6 previous errors
 
diff --git a/src/test/ui/const-generics/macro_rules-braces.min.stderr b/src/test/ui/const-generics/macro_rules-braces.min.stderr
index 1fe18e3fc0231..a4ef732017dd5 100644
--- a/src/test/ui/const-generics/macro_rules-braces.min.stderr
+++ b/src/test/ui/const-generics/macro_rules-braces.min.stderr
@@ -9,6 +9,17 @@ help: enclose the `const` expression in braces
 LL |     let _: baz!({ N });
    |                 ^   ^
 
+error: expressions must be enclosed in braces to be used as const generic arguments
+  --> $DIR/macro_rules-braces.rs:54:17
+   |
+LL |     let _: baz!(10 + 7);
+   |                 ^^^^^^
+   |
+help: enclose the `const` expression in braces
+   |
+LL |     let _: baz!({ 10 + 7 });
+   |                 ^        ^
+
 error: generic parameters may not be used in const operations
   --> $DIR/macro_rules-braces.rs:31:20
    |
@@ -41,5 +52,5 @@ LL |     let _: biz!({ N });
    |
    = help: const parameters may only be used as standalone arguments, i.e. `N`
 
-error: aborting due to 5 previous errors
+error: aborting due to 6 previous errors
 
diff --git a/src/test/ui/const-generics/macro_rules-braces.rs b/src/test/ui/const-generics/macro_rules-braces.rs
index c3e2c8ba20359..bc67d464f11bb 100644
--- a/src/test/ui/const-generics/macro_rules-braces.rs
+++ b/src/test/ui/const-generics/macro_rules-braces.rs
@@ -36,6 +36,26 @@ fn test<const N: usize>() {
     let _: baz!({{ N }}); //[min]~ ERROR generic parameters may not
     let _: biz!(N);
     let _: biz!({ N }); //[min]~ ERROR generic parameters may not
+    let _: foo!(3);
+    let _: foo!({ 3 });
+    let _: foo!({{ 3 }});
+    let _: bar!(3);
+    let _: bar!({ 3 });
+    let _: baz!(3);
+    let _: baz!({ 3 });
+    let _: baz!({{ 3 }});
+    let _: biz!(3);
+    let _: biz!({ 3 });
+    let _: foo!(10 + 7);
+    let _: foo!({ 10 + 7 });
+    let _: foo!({{ 10 + 7 }});
+    let _: bar!(10 + 7);
+    let _: bar!({ 10 + 7 });
+    let _: baz!(10 + 7); //~ ERROR expressions must be enclosed in braces
+    let _: baz!({ 10 + 7 });
+    let _: baz!({{ 10 + 7 }});
+    let _: biz!(10 + 7);
+    let _: biz!({ 10 + 7 });
 }
 
 fn main() {