Rollup merge of #139294 - beetrees:fix-f16-f128-literal-feature-gate, r=fmease

Fix the `f16`/`f128` feature gates on integer literals

The feature gating logic for `f16`/`f128` currently only checks float literals, meaning this code currently compiles with no feature gates on stable ([playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=b0c0e285ccb822fc7e2abc595557886b)):
```rust
fn main() {
    let a = 1f16;
    let b = 1f128;
    dbg!(a, b);
}
```
This PR fixes that.

Tracking issue: #116909

1 files changed, 12 insertions, 10 deletions

diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs
index 0ff313d5849..e312f15f05b 100644
--- a/compiler/rustc_ast_passes/src/feature_gate.rs
+++ b/compiler/rustc_ast_passes/src/feature_gate.rs
@@ -332,17 +332,19 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
             ast::ExprKind::TryBlock(_) => {
                 gate!(&self, try_blocks, e.span, "`try` expression is experimental");
             }
-            ast::ExprKind::Lit(token::Lit { kind: token::LitKind::Float, suffix, .. }) => {
-                match suffix {
-                    Some(sym::f16) => {
-                        gate!(&self, f16, e.span, "the type `f16` is unstable")
-                    }
-                    Some(sym::f128) => {
-                        gate!(&self, f128, e.span, "the type `f128` is unstable")
-                    }
-                    _ => (),
+            ast::ExprKind::Lit(token::Lit {
+                kind: token::LitKind::Float | token::LitKind::Integer,
+                suffix,
+                ..
+            }) => match suffix {
+                Some(sym::f16) => {
+                    gate!(&self, f16, e.span, "the type `f16` is unstable")
                 }
-            }
+                Some(sym::f128) => {
+                    gate!(&self, f128, e.span, "the type `f128` is unstable")
+                }
+                _ => (),
+            },
             _ => {}
         }
         visit::walk_expr(self, e)