chore!: convert TraitMethodNotInScope to error

compiler/noirc_frontend/src/hir/resolution/import.rs

@@ -112,7 +112,7 @@ impl<'a> From<&'a PathResolutionError> for CustomDiagnostic {
                 CustomDiagnostic::simple_error(error.to_string(), String::new(), ident.location())
             }
             PathResolutionError::TraitMethodNotInScope { ident, .. } => {
-                CustomDiagnostic::simple_warning(error.to_string(), String::new(), ident.location())
+                CustomDiagnostic::simple_error(error.to_string(), String::new(), ident.location())
             }
             PathResolutionError::UnresolvedWithPossibleTraitsToImport { ident, traits } => {
                 let mut traits = vecmap(traits, |trait_name| format!("`{}`", trait_name));

test_programs/execution_success/derive/src/main.nr

@@ -1,4 +1,4 @@
-use std::hash::Hash;
+use std::hash::{Hash, Hasher};
 
 #[derive_via(derive_do_nothing)]
 trait DoNothing {

test_programs/execution_success/embedded_curve_ops/src/main.nr

@@ -1,3 +1,5 @@
+use std::ops::Add;
+
 fn main(priv_key: Field, pub_x: pub Field, pub_y: pub Field) {
     let g1_y = 17631683881184975370165255887551781615748388533673675138860;
     let g1 = std::embedded_curve_ops::EmbeddedCurvePoint { x: 1, y: g1_y, is_infinite: false };

test_programs/execution_success/inline_decompose_hint_brillig_call/src/main.nr

@@ -1,4 +1,7 @@
-use std::embedded_curve_ops::{EmbeddedCurvePoint, EmbeddedCurveScalar, fixed_base_scalar_mul};
+use std::{
+    embedded_curve_ops::{EmbeddedCurvePoint, EmbeddedCurveScalar, fixed_base_scalar_mul},
+    ops::Add,
+};
 
 fn main() -> pub Field {
     let pre_address = 0x23d95e303879a5d0bbef78ecbc335e559da37431f6dcd11da54ed375c2846813;

test_programs/execution_success/traits_in_crates_1/crate1/src/lib.nr

@@ -1,4 +1,4 @@
-trait MyTrait {
+pub trait MyTrait {
     fn Add10(&mut self);
 }
 

test_programs/execution_success/traits_in_crates_1/crate2/src/lib.nr

@@ -1,3 +1,3 @@
-struct MyStruct {
-    Q: Field,
+pub struct MyStruct {
+    pub Q: Field,
 }

test_programs/execution_success/traits_in_crates_1/src/main.nr

@@ -1,3 +1,5 @@
+use crate1::MyTrait;
+
 fn main(x: Field, y: pub Field) {
     let mut V = crate2::MyStruct { Q: x };
     V.Add10();

test_programs/execution_success/traits_in_crates_2/crate1/src/lib.nr

@@ -1,3 +1,3 @@
-trait MyTrait {
+pub trait MyTrait {
     fn Add10(&mut self);
 }

test_programs/execution_success/traits_in_crates_2/crate2/src/lib.nr

@@ -1,5 +1,5 @@
-struct MyStruct {
-    Q: Field,
+pub struct MyStruct {
+    pub Q: Field,
 }
 
 impl crate1::MyTrait for MyStruct {

test_programs/execution_success/traits_in_crates_2/src/main.nr

@@ -1,3 +1,5 @@
+use crate1::MyTrait;
+
 fn main(x: Field, y: pub Field) {
     let mut V = crate2::MyStruct { Q: x };
     V.Add10();

tooling/nargo_cli/tests/stdlib-props.rs

@@ -177,7 +177,10 @@ fn fuzz_poseidon_equivalence() {
     // Noir has hashes up to length 16, but the reference library won't work with more than 12.
     for len in 1..light_poseidon::MAX_X5_LEN {
         let source = format!(
-            "fn main(input: [Field; {len}]) -> pub Field {{
+            "
+            use std::hash::{{Hash, Hasher}};
+
+            fn main(input: [Field; {len}]) -> pub Field {{
                 let h1 = std::hash::poseidon::bn254::hash_{len}(input);
                 let h2 = {{
                     let mut hasher = std::hash::poseidon::PoseidonHasher::default();