Revert "Alias to keywords (eg source) (#4835)" (#4841)

This reverts commit c023d4111a.

crates/nu-command/tests/commands/alias.rs

@@ -1,13 +0,0 @@
-use nu_test_support::{nu, pipeline};
-
-#[test]
-fn echo_range_is_lazy() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", pipeline(
-        r#"
-        alias bar = source sample_def.nu; bar; greet
-        "#
-    ));
-
-    assert_eq!(actual.out, "hello");
-}

crates/nu-command/tests/commands/mod.rs

@@ -1,4 +1,3 @@
-mod alias;
 mod all;
 mod any;
 mod append;

crates/nu-parser/src/parser.rs

@@ -897,19 +897,10 @@ pub fn parse_call(
                     new_spans.extend(&spans[(pos + 1)..]);
                 }
 
-                let alias_id = working_set.hide_alias(&name);
+                working_set.enter_scope();
-                let lite_command = LiteCommand {
+                working_set.hide_alias(&name);
-                    comments: vec![],
+                let (mut result, err) = parse_expression(working_set, &new_spans, false);
-                    parts: new_spans.clone(),
+                working_set.exit_scope();
-                };
-                let (mut result, err) = parse_builtin_commands(working_set, &lite_command);
-                if let Some(frame) = working_set.delta.scope.last_mut() {
-                    if let Some(alias_id) = alias_id {
-                        frame.aliases.insert(name.clone(), alias_id);
-                    }
-                }
-
-                let mut result = result.expressions.remove(0);
 
                 result.replace_span(working_set, expansion_span, orig_span);
 

tests/fixtures/formats/sample_def.nu

@@ -1,3 +0,0 @@
-def greet [] {
-  "hello"
-}