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[ty] Add comment explaining why `HasTrackedScope` is implemented for `Identifier` and why it works (#21057)
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@ -505,8 +505,10 @@ impl HasTrackedScope for ast::Expr {}
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impl HasTrackedScope for ast::ExprRef<'_> {}
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impl HasTrackedScope for &ast::ExprRef<'_> {}
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// See https://github.com/astral-sh/ty/issues/572 why this implementation exists
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// even when we never register identifiers during semantic index building.
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// We never explicitly register the scope of an `Identifier`.
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// However, `ExpressionsScopeMap` stores the text ranges of each scope.
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// That allows us to look up the identifier's scope for as long as it's
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// inside an expression (because the ranges overlap).
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impl HasTrackedScope for ast::Identifier {}
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#[cfg(test)]
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