make [from_str_radix_10] skip constant context

clippy_lints/src/from_str_radix_10.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::is_integer_literal;
 use clippy_utils::sugg::Sugg;
 use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
+use clippy_utils::{in_constant, is_integer_literal};
 use rustc_errors::Applicability;
 use rustc_hir::{def, Expr, ExprKind, LangItem, PrimTy, QPath, TyKind};
 use rustc_lint::{LateContext, LateLintPass};
@@ -47,6 +47,9 @@ impl<'tcx> LateLintPass<'tcx> for FromStrRadix10 {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, exp: &Expr<'tcx>) {
         if let ExprKind::Call(maybe_path, [src, radix]) = &exp.kind
             && let ExprKind::Path(QPath::TypeRelative(ty, pathseg)) = &maybe_path.kind
+            // do not lint in constant context, because the suggestion won't work.
+            // NB: keep this check until a new `const_trait_impl` is available and stablized.
+            && !in_constant(cx, exp.hir_id)
 
             // check if the first part of the path is some integer primitive
             && let TyKind::Path(ty_qpath) = &ty.kind

tests/ui/from_str_radix_10.fixed

@@ -1,3 +1,4 @@
+#![feature(const_int_from_str)]
 #![warn(clippy::from_str_radix_10)]
 
 mod some_mod {
@@ -59,3 +60,13 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     Ok(())
 }
+
+fn issue_12732() {
+    const A: Result<u32, std::num::ParseIntError> = u32::from_str_radix("123", 10);
+    const B: () = {
+        let _ = u32::from_str_radix("123", 10);
+    };
+    const fn foo() {
+        let _ = u32::from_str_radix("123", 10);
+    }
+}

tests/ui/from_str_radix_10.rs

@@ -1,3 +1,4 @@
+#![feature(const_int_from_str)]
 #![warn(clippy::from_str_radix_10)]
 
 mod some_mod {
@@ -59,3 +60,13 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     Ok(())
 }
+
+fn issue_12732() {
+    const A: Result<u32, std::num::ParseIntError> = u32::from_str_radix("123", 10);
+    const B: () = {
+        let _ = u32::from_str_radix("123", 10);
+    };
+    const fn foo() {
+        let _ = u32::from_str_radix("123", 10);
+    }
+}

tests/ui/from_str_radix_10.stderr

@@ -1,5 +1,5 @@
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:28:5
+  --> tests/ui/from_str_radix_10.rs:29:5
    |
 LL |     u32::from_str_radix("30", 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `"30".parse::<u32>()`
@@ -8,43 +8,43 @@ LL |     u32::from_str_radix("30", 10)?;
    = help: to override `-D warnings` add `#[allow(clippy::from_str_radix_10)]`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:31:5
+  --> tests/ui/from_str_radix_10.rs:32:5
    |
 LL |     i64::from_str_radix("24", 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `"24".parse::<i64>()`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:33:5
+  --> tests/ui/from_str_radix_10.rs:34:5
    |
 LL |     isize::from_str_radix("100", 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `"100".parse::<isize>()`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:35:5
+  --> tests/ui/from_str_radix_10.rs:36:5
    |
 LL |     u8::from_str_radix("7", 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `"7".parse::<u8>()`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:37:5
+  --> tests/ui/from_str_radix_10.rs:38:5
    |
 LL |     u16::from_str_radix(&("10".to_owned() + "5"), 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `("10".to_owned() + "5").parse::<u16>()`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:39:5
+  --> tests/ui/from_str_radix_10.rs:40:5
    |
 LL |     i128::from_str_radix(Test + Test, 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `(Test + Test).parse::<i128>()`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:43:5
+  --> tests/ui/from_str_radix_10.rs:44:5
    |
 LL |     i32::from_str_radix(string, 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `string.parse::<i32>()`
 
 error: this call to `from_str_radix` can be replaced with a call to `str::parse`
-  --> tests/ui/from_str_radix_10.rs:47:5
+  --> tests/ui/from_str_radix_10.rs:48:5
    |
 LL |     i32::from_str_radix(&stringier, 10)?;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `stringier.parse::<i32>()`