avoid specializing a closure in the compiler (JuliaLang#40256)

Author: JeffBezanson

base/compiler/abstractinterpretation.jl

@@ -1450,9 +1450,9 @@ function abstract_eval_statement(interp::AbstractInterpreter, @nospecialize(e),
         if length(e.args) == 2 && isconcretetype(t) && !t.mutable
             at = abstract_eval_value(interp, e.args[2], vtypes, sv)
             n = fieldcount(t)
-            if isa(at, Const) && (val = at.val; isa(val, Tuple)) && n == length(val) &&
-                let t = t, val = val; _all(i->val[i] isa fieldtype(t, i), 1:n); end
-                t = Const(ccall(:jl_new_structt, Any, (Any, Any), t, val))
+            if isa(at, Const) && isa(at.val, Tuple) && n == length(at.val) &&
+                let t = t; _all(i->getfield(at.val, i) isa fieldtype(t, i), 1:n); end
+                t = Const(ccall(:jl_new_structt, Any, (Any, Any), t, at.val))
             elseif isa(at, PartialStruct) && at ⊑ Tuple && n == length(at.fields) &&
                 let t = t, at = at; _all(i->at.fields[i] ⊑ fieldtype(t, i), 1:n); end
                 t = PartialStruct(t, at.fields)