fix

Author: Rob23oba

Batteries/Tactic/Alias.lean

@@ -87,7 +87,7 @@ elab (name := alias) mods:declModifiers "alias " alias:ident " := " name:ident :
     let declMods ← elabModifiers mods
     let (attrs, machineApplicable) := setDeprecatedTarget name declMods.attrs
     let declMods := { declMods with
-      isNoncomputable := declMods.isNoncomputable || isNoncomputable (← getEnv) name
+      computeKind := if isNoncomputable (← getEnv) name then .noncomputable else declMods.computeKind
       isUnsafe := declMods.isUnsafe || cinfo.isUnsafe
       attrs
     }