yu532758082: > I tried this code: > > > use syn::{parse::{Parse, ParseStream}}; > use syn::{Attribute, Error, Expr, ExprLit, Ident, Lit, LitStr, Meta, Result, Token}; > > > fn parse_attr<const LEN: usize>(path: [&'static str; LEN], attr: &Attribute) -> Option<LitStr> { > if let Meta::NameValue(name_value) = &attr.meta { > let path_idents = name_value.path.segments.iter().map(|segment| &segment.ident); > > if itertools::equal(path_idents, path) > && let Expr::Lit(ExprLit { lit: Lit::Str(s), .. }) = &name_value.value > { > return Some(s.clone()); > } > } > > None > } > Are you sure that is the code you tried? Syn isn't used anywhere inside the compiler, let alone close to MIR.

I tried this code: use syn::{parse::{Parse, ParseStream}}; use syn::{Attribute, Error, Expr, ExprLit, Ident, Lit, LitStr, Meta, Result, Token}; fn parse_attr<const LEN: usize>(path: [&'static str; LEN], attr: &Attribute) -> Option<LitStr> { if let Meta::NameValue(name_value) = &attr.meta { let path_idents = name_value.path.segments.iter().map(|segment| &segment.ident); if itertools::equal(path_idents, path) && let Expr::Lit(ExprLit { lit: Lit::Str(s), .. }) = &name_value.value { return Some(s.clone()); } } None } I am trying to get the instance of all functions called by a function at the Mir layer. For some reason, the Instance list I detected is different when I detect this code in the entire project and directly detect this code separately, but the MIR of these two codes is the same (in a workspace and in a crate alone) The problem I'm having is that when I detect the instance of the function being called inside parse_attr, I don't add the Len const parameter to ParamEnv, so I want to try to add it manually. But I didn't find the corresponding interface to generate a ParamEnv or add Clauses `rustc --version --verbose`: nightly-2024-10-09

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