chore(hir): hoist "main" constant for reuse

crates/noirc_frontend/src/hir/def_map/mod.rs

@@ -18,6 +18,9 @@ pub use module_data::*;
 mod namespace;
 pub use namespace::*;
 
+/// The name that is used for a non-contract program's entry-point function.
+pub const MAIN_FUNCTION: &str = "main";
+
 // XXX: Ultimately, we want to constrain an index to be of a certain type just like in RA
 /// Lets first check if this is offered by any external crate
 /// XXX: RA has made this a crate on crates.io
@@ -104,8 +107,6 @@ impl CrateDefMap {
 
     /// Find the main function for this crate
     pub fn main_function(&self) -> Option<FuncId> {
-        const MAIN_FUNCTION: &str = "main";
-
         let root_module = &self.modules()[self.root.0];
 
         // This function accepts an Ident, so we attach a dummy span to

crates/noirc_frontend/src/hir/resolution/resolver.rs

@@ -22,7 +22,7 @@ use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use std::rc::Rc;
 
 use crate::graph::CrateId;
-use crate::hir::def_map::{ModuleDefId, TryFromModuleDefId};
+use crate::hir::def_map::{ModuleDefId, TryFromModuleDefId, MAIN_FUNCTION};
 use crate::hir_def::stmt::{HirAssignStatement, HirLValue, HirPattern};
 use crate::node_interner::{
     DefinitionId, DefinitionKind, ExprId, FuncId, NodeInterner, StmtId, StructId,
@@ -677,7 +677,7 @@ impl<'a> Resolver<'a> {
         if self.in_contract() {
             !func.def.is_unconstrained && !func.def.is_open
         } else {
-            func.name() == "main"
+            func.name() == MAIN_FUNCTION
         }
     }
 
@@ -688,7 +688,7 @@ impl<'a> Resolver<'a> {
             // witness indices in their abis is not a concern.
             !func.def.is_unconstrained && !func.def.is_open
         } else {
-            func.name() == "main"
+            func.name() == MAIN_FUNCTION
         }
     }