ccall sometimes fails to statically evaluate arguments due to binding ages

[topolarity]

using Zstd_jll
const prefix = "Zstd version: "
const sym = :ZSTD_versionString
get_zstd_version() = prefix * unsafe_string(ccall((sym, libzstd), Cstring, ()))

On nightly:

julia> get_zstd_version()
ERROR: TypeError: in ccall: first argument not a pointer or valid constant expression, expected Ptr, got a value of type Tuple{Symbol, String}

It works if you swap the constant definition order:

using Zstd_jll
const sym = :ZSTD_versionString
const prefix = "Zstd version: "
get_zstd_version() = prefix * unsafe_string(ccall((sym, libzstd), Cstring, ()))

julia> get_zstd_version()
"Zstd version: 1.5.7"

This happens because the usage of prefix restricted the valid world range more tightly

[topolarity]

This is only noticeably affecting 3 packages in the latest nightly PkgEval (3/10):

• JuliaInterpreter (PkgEval log / source code)
• PyCallJLD2.jl (PkgEval log / source code)
• ADCME.jl (PkgEval log / source code)

The first is probably due to the prediction of static vs. dynamic ccall being incorrect under the new binding logic