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Add notes about nightly rustc version for the rustc-driver examples

This commit is contained in:
JohnTitor 2021-03-28 20:01:00 +09:00 committed by Joshua Nelson
parent 64504ada90
commit ae4208314d
2 changed files with 15 additions and 9 deletions
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11
src/rustc-driver-getting-diagnostics.md
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@ -4,12 +4,15 @@
## Getting diagnostics
To get diagnostics from the compiler,
configure `rustc_interface::Config` to output diagnostic to a buffer,
and run `TyCtxt.analysis`:
To get diagnostics from the compiler,
configure `rustc_interface::Config` to output diagnostic to a buffer,
and run `TyCtxt.analysis`. The following should be compiled
with <!-- date: 2021-03 --> `nightly-2021-03-28` (See [here][example]
for the complete example):
[example]: https://github.com/rust-lang/rustc-dev-guide/blob/master/examples/rustc-driver-getting-diagnostics.rs
```rust
// See https://github.com/rust-lang/rustc-dev-guide/blob/master/examples/rustc-driver-getting-diagnostics.rs for complete program.
let buffer = sync::Arc::new(sync::Mutex::new(Vec::new()));
let config = rustc_interface::Config {
opts: config::Options {

13
src/rustc-driver-interacting-with-the-ast.md
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@ -4,10 +4,13 @@
## Getting the type of an expression
To get the type of an expression, use the `global_ctxt` to get a `TyCtxt`:
To get the type of an expression, use the `global_ctxt` to get a `TyCtxt`.
The following should be compiled with <!-- date: 2021-03 --> `nightly-2021-03-28`
(see [here][example] for the complete example):
[example]: https://github.com/rust-lang/rustc-dev-guide/blob/master/examples/rustc-driver-interacting-with-the-ast.rs
```rust
// See https://github.com/rust-lang/rustc-dev-guide/blob/master/examples/rustc-driver-interacting-with-the-ast.rs for complete program.
let config = rustc_interface::Config {
input: config::Input::Str {
name: source_map::FileName::Custom("main.rs".to_string()),
@ -21,9 +24,9 @@ rustc_interface::run_compiler(config, |compiler| {
// Analyze the crate and inspect the types under the cursor.
queries.global_ctxt().unwrap().take().enter(|tcx| {
// Every compilation contains a single crate.
let krate = tcx.hir().krate();
let hir_krate = tcx.hir().krate();
// Iterate over the top-level items in the crate, looking for the main function.
for (_, item) in &krate.items {
for (_, item) in &hir_krate.items {
// Use pattern-matching to find a specific node inside the main function.
if let rustc_hir::ItemKind::Fn(_, _, body_id) = item.kind {
let expr = &tcx.hir().body(body_id).value;
@ -31,7 +34,7 @@ rustc_interface::run_compiler(config, |compiler| {
if let rustc_hir::StmtKind::Local(local) = block.stmts[0].kind {
if let Some(expr) = local.init {
let hir_id = expr.hir_id; // hir_id identifies the string "Hello, world!"
let def_id = tcx.hir().local_def_id(item.hir_id); // def_id identifies the main function
let def_id = tcx.hir().local_def_id(item.hir_id()); // def_id identifies the main function
let ty = tcx.typeck(def_id).node_type(hir_id);
println!("{:?}: {:?}", expr, ty); // prints expr(HirId { owner: DefIndex(3), local_id: 4 }: "Hello, world!"): &'static str
}