build(rust): vendor googletest crate
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// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// There are no visible documentation elements in this module; the declarative
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// macro is documented at the top level.
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#![doc(hidden)]
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/// Functions for use only by the declarative macros in this module.
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///
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/// **For internal use only. API stablility is not guaranteed!**
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#[doc(hidden)]
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pub mod internal {
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use crate::{
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description::Description,
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matcher::{Matcher, MatcherBase, MatcherResult},
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};
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use std::fmt::Debug;
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impl MatcherBase for () {}
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// This implementation is provided for completeness, but is completely trivial.
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// The only actual value which can be supplied is (), which must match.
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impl Matcher<()> for () {
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fn matches(&self, _: ()) -> MatcherResult {
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MatcherResult::Match
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}
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fn describe(&self, matcher_result: MatcherResult) -> Description {
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match matcher_result {
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MatcherResult::Match => "is the empty tuple".into(),
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MatcherResult::NoMatch => "is not the empty tuple".into(),
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}
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}
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}
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impl Matcher<&()> for () {
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fn matches(&self, _: &()) -> MatcherResult {
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MatcherResult::Match
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}
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fn describe(&self, matcher_result: MatcherResult) -> Description {
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<Self as Matcher<()>>::describe(self, matcher_result)
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}
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}
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/// Generates a tuple matcher for tuples of a specific length.
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///
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/// **For internal use only. API stablility is not guaranteed!**
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#[doc(hidden)]
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macro_rules! tuple_matcher_n {
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($([$field_number:tt, $matcher_type:ident, $field_type:ident]),*) => {
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impl<$($matcher_type: MatcherBase),*> MatcherBase for ($($matcher_type,)*){}
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impl<$($field_type: Debug + Copy, $matcher_type: Matcher<$field_type>),*>
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Matcher<($($field_type,)*)> for ($($matcher_type,)*)
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{
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fn matches(&self, actual: ($($field_type,)*)) -> MatcherResult {
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$(match self.$field_number.matches(actual.$field_number) {
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MatcherResult::Match => {},
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MatcherResult::NoMatch => {
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return MatcherResult::NoMatch;
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}
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})*
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MatcherResult::Match
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}
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fn explain_match(&self, actual: ($($field_type,)*)) -> Description {
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let mut explanation = Description::new().text("which").nested(
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self.describe(self.matches(actual)));
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$(match self.$field_number.matches(actual.$field_number) {
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MatcherResult::Match => {},
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MatcherResult::NoMatch => {
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explanation = explanation
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.text(format!(concat!("Element #", $field_number, " is {:?},"),
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actual.$field_number))
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.nested(self.$field_number.explain_match(actual.$field_number));
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}
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})*
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explanation
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}
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fn describe(&self, matcher_result: MatcherResult) -> Description {
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match matcher_result {
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MatcherResult::Match => {
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let mut description = Description::new().text(
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"is a tuple whose values respectively match:");
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$(description = description.nested(
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self.$field_number.describe(matcher_result));)*
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description
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}
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MatcherResult::NoMatch => {
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let mut description = Description::new().text(
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"is a tuple whose values do not respectively match:");
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$(description = description.nested(
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self.$field_number.describe(MatcherResult::Match));)*
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description
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}
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}
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}
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}
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impl<'a, $($field_type: Debug, $matcher_type: Matcher<&'a $field_type>),*>
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Matcher<&'a ($($field_type,)*)> for ($($matcher_type,)*)
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{
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fn matches(&self, actual: &'a ($($field_type,)*)) -> MatcherResult {
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$(match self.$field_number.matches(&actual.$field_number) {
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MatcherResult::Match => {},
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MatcherResult::NoMatch => {
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return MatcherResult::NoMatch;
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}
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})*
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MatcherResult::Match
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}
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fn explain_match(&self, actual: &'a ($($field_type,)*)) -> Description {
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let mut explanation = Description::new()
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.text("which")
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.nested(
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Matcher::<&'a ($($field_type,)*)>::describe(
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self, self.matches(actual)));
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$(match self.$field_number.matches(&actual.$field_number) {
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MatcherResult::Match => {},
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MatcherResult::NoMatch => {
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explanation = explanation
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.text(format!(
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concat!(
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"Element #",
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$field_number,
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" is {:?},"),
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actual.$field_number))
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.nested(self.$field_number.explain_match(&actual.$field_number));
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}
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})*
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explanation
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}
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fn describe(&self, matcher_result: MatcherResult) -> Description {
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match matcher_result {
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MatcherResult::Match => {
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let mut description = Description::new().text(
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"is a tuple whose values respectively match:");
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$(description = description.nested(
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self.$field_number.describe(matcher_result));)*
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description
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}
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MatcherResult::NoMatch => {
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let mut description = Description::new().text(
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"is a tuple whose values do not respectively match:");
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$(description = description.nested(
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self.$field_number.describe(MatcherResult::Match));)*
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description
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}
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}
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}
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}
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};
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}
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tuple_matcher_n!([0, I0, T0]);
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tuple_matcher_n!([0, I0, T0], [1, I1, T1]);
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tuple_matcher_n!([0, I0, T0], [1, I1, T1], [2, I2, T2]);
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tuple_matcher_n!([0, I0, T0], [1, I1, T1], [2, I2, T2], [3, I3, T3]);
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tuple_matcher_n!([0, I0, T0], [1, I1, T1], [2, I2, T2], [3, I3, T3], [4, I4, T4]);
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tuple_matcher_n!([0, I0, T0], [1, I1, T1], [2, I2, T2], [3, I3, T3], [4, I4, T4], [5, I5, T5]);
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tuple_matcher_n!(
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[0, I0, T0],
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[1, I1, T1],
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[2, I2, T2],
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[3, I3, T3],
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[4, I4, T4],
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[5, I5, T5],
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[6, I6, T6]
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);
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tuple_matcher_n!(
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[0, I0, T0],
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[1, I1, T1],
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[2, I2, T2],
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[3, I3, T3],
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[4, I4, T4],
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[5, I5, T5],
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[6, I6, T6],
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[7, I7, T7]
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);
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tuple_matcher_n!(
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[0, I0, T0],
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[1, I1, T1],
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[2, I2, T2],
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[3, I3, T3],
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[4, I4, T4],
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[5, I5, T5],
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[6, I6, T6],
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[7, I7, T7],
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[8, I8, T8]
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);
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tuple_matcher_n!(
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[0, I0, T0],
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[1, I1, T1],
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[2, I2, T2],
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[3, I3, T3],
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[4, I4, T4],
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[5, I5, T5],
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[6, I6, T6],
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[7, I7, T7],
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[8, I8, T8],
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[9, I9, T9]
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);
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tuple_matcher_n!(
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[0, I0, T0],
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[1, I1, T1],
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[2, I2, T2],
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[3, I3, T3],
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[4, I4, T4],
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[5, I5, T5],
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[6, I6, T6],
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[7, I7, T7],
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[8, I8, T8],
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[9, I9, T9],
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[10, I10, T10]
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);
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tuple_matcher_n!(
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[0, I0, T0],
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[1, I1, T1],
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[2, I2, T2],
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[3, I3, T3],
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[4, I4, T4],
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[5, I5, T5],
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[6, I6, T6],
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[7, I7, T7],
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[8, I8, T8],
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[9, I9, T9],
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[10, I10, T10],
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[11, I11, T11]
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);
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}
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