Fix scoped overlay use not finding a module (#6474)

* Add source-env test for dynamic path

* Use correct module ID for env overlay imports

* Remove parser check from "overlay list"

It would cause unnecessary errors from some inner scope if some
overlay module was also defined in some inner scope.

* Restore Cargo.lock back

* Remove comments

crates/nu-protocol/src/ast/call.rs

@@ -82,6 +82,10 @@ impl Call {
         self.positional_iter().nth(i)
     }
 
+    pub fn positional_nth_mut(&mut self, i: usize) -> Option<&mut Expression> {
+        self.positional_iter_mut().nth(i)
+    }
+
     pub fn positional_len(&self) -> usize {
         self.positional_iter().count()
     }

crates/nu-protocol/src/ast/expr.rs

@@ -39,6 +39,7 @@ pub enum Expr {
     CellPath(CellPath),
     FullCellPath(Box<FullCellPath>),
     ImportPattern(ImportPattern),
+    Overlay(Option<BlockId>), // block ID of the overlay's origin module
     Signature(Box<Signature>),
     StringInterpolation(Vec<Expression>),
     Nothing,

crates/nu-protocol/src/ast/expression.rs

@@ -169,6 +169,7 @@ impl Expression {
                 false
             }
             Expr::ImportPattern(_) => false,
+            Expr::Overlay(_) => false,
             Expr::Filepath(_) => false,
             Expr::Directory(_) => false,
             Expr::Float(_) => false,
@@ -337,6 +338,7 @@ impl Expression {
                     .replace_in_variable(working_set, new_var_id);
             }
             Expr::ImportPattern(_) => {}
+            Expr::Overlay(_) => {}
             Expr::Garbage => {}
             Expr::Nothing => {}
             Expr::GlobPattern(_) => {}
@@ -485,6 +487,7 @@ impl Expression {
                     .replace_span(working_set, replaced, new_span);
             }
             Expr::ImportPattern(_) => {}
+            Expr::Overlay(_) => {}
             Expr::Garbage => {}
             Expr::Nothing => {}
             Expr::GlobPattern(_) => {}