Merge pull request #154 from nikomatsakis/parser-cleanup

Parser cleanup

.github/workflows/ci.yaml

@@ -15,8 +15,14 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
-      - name: Run cargo test
+      - name: Run cargo test --all
         uses: actions-rs/cargo@v1
         with:
           command: test
           args: --all
+      - name: Run cargo test --all-targets
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-targets
+

book/src/formality_core/parse.md

@@ -31,14 +31,14 @@ When parsing an enum there will be multiple possibilities. We will attempt to pa
 We support left-recursive grammars like this one from the `parse-torture-tests`:
 
 ```rust
-{{#include ../../../tests/parser-torture-tests/src/path.rs:path}}
+{{#include ../../../tests/parser-torture-tests/path.rs:path}}
 ```
 
 We also support ambiguous grammars. For example, you can code up arithmetic expressions like this:
 
 
 ```rust
-{{#include ../../../tests/parser-torture-tests/src/left_associative.rs:Expr}}
+{{#include ../../../tests/parser-torture-tests/left_associative.rs:Expr}}
 ```
 
 When specifying the `#[precedence]` of a variant, the default is left-associativity, which can be written more explicitly as `#[precedence(L, left)]`. If you prefer, you can specify right-associativity (`#[precedence(L, right)]`) or non-associativity `#[precedence(L, none)]`. This affects how things of the same level are parsed:
@@ -71,7 +71,7 @@ A grammar consists of a series of *symbols*. Each symbol matches some text in th
     * `$[?field]` -- parse `[E1, E2, E3]`, where `field: Vec<E>`, but accept empty string as empty vector
     * `${field}` -- parse `{E1, E2, E3}`, where `field: Vec<E>` 
     * `${?field}` -- parse `{E1, E2, E3}`, where `field: Vec<E>`, but accept empty string as empty vector
-    * `$:guard <nonterminal>` -- parses `<nonterminal>` but only if the keyword `guard` is present. For example, `$:where $,where_clauses` would parse `where WhereClause1, WhereClause2, WhereClause3`
+    * `$:guard <nonterminal>` -- parses `<nonterminal>` but only if the keyword `guard` is present. For example, `$:where $,where_clauses` would parse `where WhereClause1, WhereClause2, WhereClause3` but would also accept nothing (in which case, you would get an empty vector).
 
 ### Greediness
 

crates/formality-core/src/parse/parser/left_recursion.rs

@@ -180,7 +180,7 @@ impl StackEntry {
     }
 }
 
-pub fn enter<'s, 't, L, T>(
+pub(super) fn enter<'s, 't, L, T>(
     scope: &'s Scope<L>,
     text: &'t str,
     mut op: impl FnMut(usize) -> ParseResult<'t, T>,
@@ -439,7 +439,7 @@ where
     }
 }
 
-pub fn recurse<'s, 't, R>(current_state: CurrentState, op: impl FnOnce() -> R) -> R {
+pub(super) fn recurse<'s, 't, R>(current_state: CurrentState, op: impl FnOnce() -> R) -> R {
     STACK.with_borrow_mut(|stack| {
         let top = stack.last_mut().unwrap();
         assert!(