# Interpolating an \`Expr\` containing \`SSAValue\`s/\`Slot\`s into another \`Expr\`

**URL:** <https://discourse.julialang.org/t/interpolating-an-expr-containing-ssavalue-s-slot-s-into-another-expr/56796>\
**Category:** General Usage\
**Created:** [March 9, 2021, 11:49am UTC](https://discourse.julialang.org/t/interpolating-an-expr-containing-ssavalue-s-slot-s-into-another-expr/56796 "2021-03-09T11:49:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BridgeBot](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bridgebot/32/21491_2.png) [@BridgeBot](https://discourse.julialang.org/u/BridgeBot)\
**Post date:** [March 9, 2021, 11:49am UTC](https://discourse.julialang.org/t/interpolating-an-expr-containing-ssavalue-s-slot-s-into-another-expr/56796/1 "2021-03-09T11:49:55Z")

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Anyone know a way to interpolate an `Expr` containing `SSAValue`s/`Slot`s into another expression? Something like

```julia
julia> @eval Main ans = $(QuoteNode(code_typed(cos, (Float64, ))[1][1].code[50]))
ERROR: syntax: SSAValue objects should not occur in an AST

```

except without the error?

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**Author:** ![simeonschaub](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/simeonschaub/32/216566_2.png) [@simeonschaub](https://discourse.julialang.org/u/simeonschaub)\
**Post date:** [March 9, 2021, 2:59pm UTC](https://discourse.julialang.org/t/interpolating-an-expr-containing-ssavalue-s-slot-s-into-another-expr/56796/2 "2021-03-09T14:59:04Z")

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This is a Julia issue. Should be fixed by [allow quoted ssa values and slots in ast by simeonschaub · Pull Request #39965 · JuliaLang/julia · GitHub](https://github.com/JuliaLang/julia/pull/39965).