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-rw-r--r--crates/ra_mbe/src/mbe_expander.rs30
1 files changed, 20 insertions, 10 deletions
diff --git a/crates/ra_mbe/src/mbe_expander.rs b/crates/ra_mbe/src/mbe_expander.rs
index c393d8487..0a5bbf6b1 100644
--- a/crates/ra_mbe/src/mbe_expander.rs
+++ b/crates/ra_mbe/src/mbe_expander.rs
@@ -9,7 +9,10 @@ use crate::{MacroRulesError, Result};
9use crate::tt_cursor::TtCursor; 9use crate::tt_cursor::TtCursor;
10 10
11pub(crate) fn expand(rules: &crate::MacroRules, input: &tt::Subtree) -> Result<tt::Subtree> { 11pub(crate) fn expand(rules: &crate::MacroRules, input: &tt::Subtree) -> Result<tt::Subtree> {
12 rules.rules.iter().find_map(|it| expand_rule(it, input).ok()) 12 rules
13 .rules
14 .iter()
15 .find_map(|it| expand_rule(it, input).ok())
13 .ok_or(MacroRulesError::NoMatchingRule) 16 .ok_or(MacroRulesError::NoMatchingRule)
14} 17}
15 18
@@ -80,21 +83,24 @@ enum Binding {
80 83
81impl Bindings { 84impl Bindings {
82 fn get(&self, name: &SmolStr, nesting: &[usize]) -> Result<&tt::TokenTree> { 85 fn get(&self, name: &SmolStr, nesting: &[usize]) -> Result<&tt::TokenTree> {
83 let mut b = self.inner.get(name).ok_or(MacroRulesError::BindingError( 86 let mut b = self
84 format!("could not find binding {}", name) 87 .inner
85 ))?; 88 .get(name)
89 .ok_or(MacroRulesError::BindingError(format!("could not find binding {}", name)))?;
86 for &idx in nesting.iter() { 90 for &idx in nesting.iter() {
87 b = match b { 91 b = match b {
88 Binding::Simple(_) => break, 92 Binding::Simple(_) => break,
89 Binding::Nested(bs) => bs.get(idx).ok_or(MacroRulesError::BindingError( 93 Binding::Nested(bs) => bs.get(idx).ok_or(MacroRulesError::BindingError(
90 format!("could not find nested binding {}", name)) 94 format!("could not find nested binding {}", name),
91 )?, 95 ))?,
92 }; 96 };
93 } 97 }
94 match b { 98 match b {
95 Binding::Simple(it) => Ok(it), 99 Binding::Simple(it) => Ok(it),
96 Binding::Nested(_) => Err(MacroRulesError::BindingError( 100 Binding::Nested(_) => Err(MacroRulesError::BindingError(format!(
97 format!("expected simple binding, found nested binding {}", name))), 101 "expected simple binding, found nested binding {}",
102 name
103 ))),
98 } 104 }
99 } 105 }
100 106
@@ -105,8 +111,12 @@ impl Bindings {
105 } 111 }
106 match self.inner.get_mut(&key) { 112 match self.inner.get_mut(&key) {
107 Some(Binding::Nested(it)) => it.push(value), 113 Some(Binding::Nested(it)) => it.push(value),
108 _ => return Err(MacroRulesError::BindingError( 114 _ => {
109 format!("nested binding for {} not found", key))), 115 return Err(MacroRulesError::BindingError(format!(
116 "nested binding for {} not found",
117 key
118 )))
119 }
110 } 120 }
111 } 121 }
112 Ok(()) 122 Ok(())