Closed
Description
Code
//lib.rs
use proc_macro::{TokenStream};
use proc_macro2::{Span};
use syn::{parse_macro_input, DeriveInput, Ident};
use quote::quote;
#[proc_macro_derive(Builder)]
pub fn derive(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let command = Ident::new(input.ident.to_string().as_str(), Span::call_site());
let cbuilder_name = format!("{}Builder", input.ident.to_string());
let command_builder = Ident::new(cbuilder_name.as_str(), Span::call_site());
let type_definition = quote! {
pub struct #command_builder {
executable: Option<String>,
args: Option<Vec<String>>,
env: Option<Vec<String>>,
current_dir: Option<String>,
}
};
let methods = quote! {
impl #command {
pub fn builder() -> #command_builder {
#command_builder {
executable: None,
args: None,
env: None,
current_dir: None,
}
}
}
impl #command_builder {
// use std::error::Error;
// type Error: Error;
fn executable(&mut self, executable: String) -> &mut Self {
self.executable = Some(executable);
self
}
fn args(&mut self, args: Vec<String>) -> &mut Self {
self.args = Some(args);
self
}
fn env(&mut self, env: Vec<String>) -> &mut Self {
self.env = Some(env);
self
}
fn current_dir(&mut self, current_dir: String) -> &mut Self {
self.current_dir = Some(current_dir);
self
}
fn build(&mut self) -> Result<#command, Box<dyn Error>> {
let c = #command {
executable: self.executable.unwrap().into(),
args: self.args.unwrap().into(),
env: self.env.unwrap().into(),
current_dir: self.current_dir.unwrap().into()
};
Ok(c)
}
}
};
let tokens = quote! {
#type_definition
#methods
};
tokens.into()
}
// tests/progress.rs
#[test]
fn tests() {
let t = trybuild::TestCases::new();
t.pass("tests/01-parse.rs");
t.pass("tests/02-create-builder.rs");
t.pass("tests/03-call-setters.rs");
// t.pass("tests/04-call-build.rs");
//t.pass("tests/05-method-chaining.rs");
//t.pass("tests/06-optional-field.rs");
//t.pass("tests/07-repeated-field.rs");
//t.compile_fail("tests/08-unrecognized-attribute.rs");
//t.pass("tests/09-redefined-prelude-types.rs");
}Meta
rustc --version --verbose:
rustc 1.53.0-nightly (07e0e2ec2 2021-03-24)
binary: rustc
commit-hash: 07e0e2ec268c140e607e1ac7f49f145612d0f597
commit-date: 2021-03-24
host: x86_64-unknown-linux-gnu
release: 1.53.0-nightly
LLVM version: 12.0.0
Error output
thread 'rustc' panicked at 'found unstable fingerprints for predicates_of(core[3998]::convert::From): GenericPredicates { parent: None, predicates: [(Binder(TraitPredicate(<Self as std::marker::Sized>)), /home/tobias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/convert/mod.rs:365:20: 365:25 (#0)), (Binder(TraitPredicate(<T as std::marker::Sized>)), /home/tobias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/convert/mod.rs:365:16: 365:17 (#0)), (Binder(TraitPredicate(<Self as std::convert::From<T>>)), /home/tobias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/convert/mod.rs:365:1: 365:25 (#0))] }', /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/compiler/rustc_query_system/src/query/plumbing.rs:593:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu
note: compiler flags: -C prefer-dynamic -C embed-bitcode=no -C debuginfo=2 -C incremental
note: some of the compiler flags provided by cargo are hidden
Backtrace
query stack during panic:
#0 [predicates_of] computing predicates of `std::convert::From`
#1 [typeck] type-checking `derive`
end of query stack
error: build failed
I am using
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
The error originated when run with cargo test