Change how we separate toplevel and global scopes

Instead of introducing a new local scope at the point of `set`, merely
push a new local scope at the end of env_init(). This means we have a
single toplevel local scope across the lifetime of the fish process,
which means that

    set -l foo bar
    echo $foo

behaves as expected, without modifying the global environment.

1 files changed, 0 insertions, 6 deletions

diff --git a/env.h b/env.h
index 605fc453..3fa64e91 100644
--- a/env.h
+++ b/env.h
@@ -206,12 +206,6 @@ void env_push(bool new_scope);
 */
 void env_pop();
 
-/**
-  Push the variable stack if the current scope is the global scope. Returns
-  whether it pushed a scope.
-*/
-bool env_ensure_local_scope();
-
 /** Synchronizes all universal variable changes: writes everything out, reads stuff in */
 void env_universal_barrier();