Allow inline consts to reference generic params

7 files changed, 83 insertions, 5 deletions

diff --git a/src/test/ui/inline-const/const-expr-generic-err.rs b/src/test/ui/inline-const/const-expr-generic-err.rs
new file mode 100644
index 00000000000..4e8879af54a
--- /dev/null
+++ b/src/test/ui/inline-const/const-expr-generic-err.rs
@@ -0,0 +1,15 @@
+// build-fail
+#![feature(inline_const)]
+
+fn foo<T>() {
+    const { assert!(std::mem::size_of::<T>() == 0); } //~ ERROR E0080
+}
+
+fn bar<const N: usize>() -> usize {
+    const { N - 1 } //~ ERROR E0080
+}
+
+fn main() {
+    foo::<i32>();
+    bar::<0>();
+}
diff --git a/src/test/ui/inline-const/const-expr-generic-err.stderr b/src/test/ui/inline-const/const-expr-generic-err.stderr
new file mode 100644
index 00000000000..db0d85a2d4e
--- /dev/null
+++ b/src/test/ui/inline-const/const-expr-generic-err.stderr
@@ -0,0 +1,29 @@
+error[E0080]: evaluation of `foo::<i32>::{constant#0}` failed
+  --> $DIR/const-expr-generic-err.rs:5:13
+   |
+LL |     const { assert!(std::mem::size_of::<T>() == 0); }
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'assertion failed: std::mem::size_of::<T>() == 0', $DIR/const-expr-generic-err.rs:5:13
+   |
+   = note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+note: the above error was encountered while instantiating `fn foo::<i32>`
+  --> $DIR/const-expr-generic-err.rs:13:5
+   |
+LL |     foo::<i32>();
+   |     ^^^^^^^^^^^^
+
+error[E0080]: evaluation of `bar::<0_usize>::{constant#0}` failed
+  --> $DIR/const-expr-generic-err.rs:9:13
+   |
+LL |     const { N - 1 }
+   |             ^^^^^ attempt to compute `0_usize - 1_usize`, which would overflow
+
+note: the above error was encountered while instantiating `fn bar::<0_usize>`
+  --> $DIR/const-expr-generic-err.rs:14:5
+   |
+LL |     bar::<0>();
+   |     ^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/src/test/ui/inline-const/const-expr-generic-err2.rs b/src/test/ui/inline-const/const-expr-generic-err2.rs
new file mode 100644
index 00000000000..e097cbe9dd6
--- /dev/null
+++ b/src/test/ui/inline-const/const-expr-generic-err2.rs
@@ -0,0 +1,10 @@
+#![feature(inline_const)]
+
+fn foo<T>() {
+    let _ = [0u8; const { std::mem::size_of::<T>() }];
+    //~^ ERROR: constant expression depends on a generic parameter
+}
+
+fn main() {
+    foo::<i32>();
+}
diff --git a/src/test/ui/inline-const/const-expr-generic-err2.stderr b/src/test/ui/inline-const/const-expr-generic-err2.stderr
new file mode 100644
index 00000000000..00b716cd259
--- /dev/null
+++ b/src/test/ui/inline-const/const-expr-generic-err2.stderr
@@ -0,0 +1,10 @@
+error: constant expression depends on a generic parameter
+  --> $DIR/const-expr-generic-err2.rs:4:19
+   |
+LL |     let _ = [0u8; const { std::mem::size_of::<T>() }];
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this may fail depending on what value the parameter takes
+
+error: aborting due to previous error
+
diff --git a/src/test/ui/inline-const/const-expr-generic.rs b/src/test/ui/inline-const/const-expr-generic.rs
new file mode 100644
index 00000000000..3207bfa0e89
--- /dev/null
+++ b/src/test/ui/inline-const/const-expr-generic.rs
@@ -0,0 +1,15 @@
+// check-pass
+#![feature(inline_const)]
+
+fn foo<T>() -> usize {
+    const { std::mem::size_of::<T>() }
+}
+
+fn bar<const N: usize>() -> usize {
+    const { N + 1 }
+}
+
+fn main() {
+    foo::<i32>();
+    bar::<1>();
+}
diff --git a/src/test/ui/inline-const/const-match-pat-generic.rs b/src/test/ui/inline-const/const-match-pat-generic.rs
index be7e1d8d449..e1946467583 100644
--- a/src/test/ui/inline-const/const-match-pat-generic.rs
+++ b/src/test/ui/inline-const/const-match-pat-generic.rs
@@ -1,6 +1,5 @@
 #![allow(incomplete_features)]
 #![feature(inline_const_pat)]
-#![feature(generic_const_exprs)]
 
 // rust-lang/rust#82518: ICE with inline-const in match referencing const-generic parameter
 
@@ -16,7 +15,7 @@ const fn f(x: usize) -> usize {
     x + 1
 }
 
-fn bar<const V: usize>() where [(); f(V)]: {
+fn bar<const V: usize>() {
     match 0 {
         const { f(V) } => {},
         //~^ ERROR constant pattern depends on a generic parameter
diff --git a/src/test/ui/inline-const/const-match-pat-generic.stderr b/src/test/ui/inline-const/const-match-pat-generic.stderr
index 5fe5a7a6dad..ade200d99ba 100644
--- a/src/test/ui/inline-const/const-match-pat-generic.stderr
+++ b/src/test/ui/inline-const/const-match-pat-generic.stderr
@@ -1,17 +1,17 @@
 error[E0158]: const parameters cannot be referenced in patterns
-  --> $DIR/const-match-pat-generic.rs:9:9
+  --> $DIR/const-match-pat-generic.rs:8:9
    |
 LL |         const { V } => {},
    |         ^^^^^^^^^^^
 
 error: constant pattern depends on a generic parameter
-  --> $DIR/const-match-pat-generic.rs:21:9
+  --> $DIR/const-match-pat-generic.rs:20:9
    |
 LL |         const { f(V) } => {},
    |         ^^^^^^^^^^^^^^
 
 error: constant pattern depends on a generic parameter
-  --> $DIR/const-match-pat-generic.rs:21:9
+  --> $DIR/const-match-pat-generic.rs:20:9
    |
 LL |         const { f(V) } => {},
    |         ^^^^^^^^^^^^^^