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internal: cleanup proc macro server error handlig

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When dealing with proc macros, there are two very different kinds of
errors:

* first, usual errors of "proc macro panicked on this particular input"
* second, the proc macro server might day if the user, eg, kills it

First kind of errors are expected and are a normal output, while the
second kind are genuine IO-errors.

For this reason, we use a curious nested result here: `Result<Result<T,
E1>, E2>` pattern, which is 100% inspired by http://sled.rs/errors.html
This commit is contained in:
Aleksey Kladov 2021-08-31 19:01:39 +03:00
parent 722a2a4690
commit d8a3d6f378
12 changed files with 242 additions and 271 deletions
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2
crates/proc_macro_srv/src/abis/abi_1_47/mod.rs
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@ -7,8 +7,8 @@ mod proc_macro;
#[allow(dead_code)]
#[doc(hidden)]
mod rustc_server;
use libloading::Library;
use libloading::Library;
use proc_macro_api::ProcMacroKind;
use super::PanicMessage;

2
crates/proc_macro_srv/src/abis/abi_1_55/mod.rs
View file

@ -7,8 +7,8 @@ mod proc_macro;
#[allow(dead_code)]
#[doc(hidden)]
mod rustc_server;
use libloading::Library;
use libloading::Library;
use proc_macro_api::ProcMacroKind;
use super::PanicMessage;

2
crates/proc_macro_srv/src/abis/abi_1_56/mod.rs
View file

@ -7,8 +7,8 @@ mod proc_macro;
#[allow(dead_code)]
#[doc(hidden)]
mod rustc_server;
use libloading::Library;
use libloading::Library;
use proc_macro_api::ProcMacroKind;
use super::PanicMessage;