fix(complete): Fix env leakage in elvish dynamic completion

Author: tw4452852

clap_complete/src/env/shells.rs

@@ -157,14 +157,10 @@ impl EnvCompleter for Elvish {
 
         let script = r#"
 set edit:completion:arg-completer[BIN] = { |@words|
-    set E:_CLAP_IFS = "\n"
-
     var index = (count $words)
     set index = (- $index 1)
-    set E:_CLAP_COMPLETE_INDEX = (to-string $index)
-    set E:VAR = "elvish"
 
-    put (COMPLETER -- $@words) | to-lines
+    put (env _CLAP_IFS="\n" _CLAP_COMPLETE_INDEX=(to-string $index) VAR="elvish" COMPLETER -- $@words) | to-lines
 }
 "#
         .replace("COMPLETER", &completer)

clap_complete/tests/snapshots/home/dynamic-env/exhaustive/elvish/elvish/rc.elv

@@ -2,14 +2,10 @@ set edit:rprompt = (constantly "")
 set edit:prompt = (constantly "% ")
 
 set edit:completion:arg-completer[exhaustive] = { |@words|
-    set E:_CLAP_IFS = "\n"
-
     var index = (count $words)
     set index = (- $index 1)
-    set E:_CLAP_COMPLETE_INDEX = (to-string $index)
-    set E:COMPLETE = "elvish"
 
-    put (exhaustive -- $@words) | to-lines
+    put (env _CLAP_IFS="\n" _CLAP_COMPLETE_INDEX=(to-string $index) COMPLETE="elvish" exhaustive -- $@words) | to-lines
 }