annotations: fix shadowing issue

src/front/resolve.rs

@@ -3,6 +3,8 @@
 //! in this place. Resolution is therefore concerned with creating and resolving
 //! variable scopes.
 
+use std::rc::Rc;
+
 use ariadne::ReportKind;
 
 use crate::{
@@ -215,15 +217,21 @@ impl<'tcx> VisitorMut for Resolve<'tcx> {
                 self.with_subscope(|this| this.visit_block(block))
             }
             StmtKind::Annotation(_, ref mut ident, ref mut args, ref mut inner_stmt) => {
-                self.visit_ident(ident)?;
-
-                match self.tcx.get(*ident).as_deref() {
-                    None => {} // Declaration not found
+                // Resolve the annotation ident to the declaration
+                // Here we only look through annotation declarations therefore other declarations do not shadow annotations
+                match self
+                    .tcx
+                    .get_statement_annotations()
+                    .get(&ident.name)
+                    .map(Rc::as_ref)
+                {
                     Some(DeclKind::AnnotationDecl(intrin)) => {
+                        *ident = intrin.name(); // Resolve to the declaration ident
                         let intrin = intrin.clone(); // clone so we can mutably borrow self
                         intrin.resolve(self, s.span, args)?;
                     }
-                    _ => {} // Not an annotation declaration
+                    _ => return Err(ResolveError::NotFound(*ident)), // Either not declared or not declared as an annotation,
+                                                                     // This case is same as None since we only look through annotations
                 }
 
                 self.with_subscope(|this| this.visit_stmt(inner_stmt))

src/tyctx.rs

@@ -9,7 +9,7 @@ use std::{
     rc::Rc,
 };
 
-use crate::ast::FuncDecl;
+use crate::{ast::FuncDecl, intrinsic::annotations::AnnotationKind};
 use crate::{
     ast::{DeclKind, DeclRef, DomainDecl, Ident, LitKind, Span, Symbol, TyKind, VarKind},
     intrinsic::distributions::DistributionProc,
@@ -157,6 +157,19 @@ impl TyCtx {
         }
     }
 
+    /// Get all annotation declarations that can be used on top of statements. These are slicing and encoding annotations.
+    pub fn get_statement_annotations(&self) -> IndexMap<Symbol, Rc<DeclKind>> {
+        IndexMap::from_iter(self.declarations.borrow().iter().flat_map(|(ident, decl)| {
+            if let DeclKind::AnnotationDecl(
+                AnnotationKind::Slicing(_) | AnnotationKind::Encoding(_),
+            ) = decl.deref()
+            {
+                return Some((ident.name, decl.clone()));
+            }
+            None
+        }))
+    }
+
     pub fn get_distributions(&self) -> IndexMap<Ident, Rc<DistributionProc>> {
         IndexMap::from_iter(self.declarations.borrow().iter().flat_map(|(ident, decl)| {
             if let DeclKind::ProcIntrin(intrin) = decl.deref() {