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specification/dartLangSpec.tex

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@@ -23648,15 +23648,15 @@ \section*{Appendix: Algorithmic Subtyping}
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then \SubtypeNE{T_0}{T_1} if{}f each of the following criteria is satisfied,
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where the $Z_i$ are fresh type variables with bounds
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$B_{0i}[Z_0/X_0, \ldots, Z_k/X_k]$:
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$[Z_0/X_0, \ldots, Z_k/X_k]B_{0i}$:
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\begin{itemize}
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\item $p \geq n$.
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\item $m \geq q$.
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\item \SubtypeNE{S_i[Z_0/Y_0, \ldots, Z_k/Y_k]}{V_i[Z_0/X_0, \ldots, Z_k/X_k]}
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\item \SubtypeNE{[Z_0/Y_0, \ldots, Z_k/Y_k]S_i}{[Z_0/X_0, \ldots, Z_k/X_k]V_i}
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for $i \in 0 .. q$.
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\item \SubtypeNE{U_0[Z_0/X_0, \ldots, Z_k/X_k]}{U_1[Z_0/Y_0, \ldots, Z_k/Y_k]}.
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\item $B_{0i}[Z_0/X_0, \ldots, Z_k/X_k]$ and $B_{1i}[Z_0/Y_0, \ldots, Z_k/Y_k]$
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\item \SubtypeNE{[Z_0/X_0, \ldots, Z_k/X_k]U_0}{[Z_0/Y_0, \ldots, Z_k/Y_k]U_1}.
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\item $[Z_0/X_0, \ldots, Z_k/X_k]B_{0i}$ and $[Z_0/Y_0, \ldots, Z_k/Y_k]B_{1i}$
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have the same canonical syntax, for $i \in 0 .. k$.
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\end{itemize}
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\item
@@ -23681,23 +23681,23 @@ \section*{Appendix: Algorithmic Subtyping}
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where $r_{1j}$ is empty or \REQUIRED{} for $j \in n+1 .. q$
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then \SubtypeNE{T_0}{T_1} if{}f the following criteria are all satisfied,
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where \List{Z}{1}{k} are fresh type variables with bounds
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$B_{0i}[Z_0/X_0, \ldots, Z_k/X_k]$:
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$[Z_0/X_0, \ldots, Z_k/X_k]B_{0i}$:
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\begin{itemize}
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\item
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$\{ y_{n+1}, \ldots, y_q \} \subseteq \{ x_{n+1}, \ldots , x_m \}$.
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\item
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\SubtypeNE{S_i[Z_0/Y_0, \ldots, Z_k/Y_k]}{V_i[Z_0/X_0, \ldots, Z_k/X_k]}
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\SubtypeNE{[Z_0/Y_0, \ldots, Z_k/Y_k]S_i}{[Z_0/X_0, \ldots, Z_k/X_k]V_i}
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for $i \in 0 .. n$.
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\item \SubtypeNE{S_i[Z_0/Y_0, \ldots, Z_k/Y_k]}{V_j[Z_0/X_0, \ldots, Z_k/X_k]}
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\item \SubtypeNE{[Z_0/Y_0, \ldots, Z_k/Y_k]S_i}{[Z_0/X_0, \ldots, Z_k/X_k]V_j}
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for $i \in n+1 .. q$, and $y_j = x_i$.
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\item
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for each $j$ such that $r_{0j}$ is \REQUIRED, there exists an
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$i \in n+1 .. q$ such that $x_j = y_i$, and $r_{1i}$ is \REQUIRED.
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\item
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\SubtypeNE{U_0[Z_0/X_0, \ldots, Z_k/X_k]}{U_1[Z_0/Y_0, \ldots, Z_k/Y_k]}.
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\SubtypeNE{[Z_0/X_0, \ldots, Z_k/X_k]U_0}{[Z_0/Y_0, \ldots, Z_k/Y_k]U_1}.
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\item
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$B_{0i}[Z_0/X_0, \ldots, Z_k/X_k]$ and $B_{1i}[Z_0/Y_0, \ldots, Z_k/Y_k]$
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$[Z_0/X_0, \ldots, Z_k/X_k]B_{0i}$ and $[Z_0/Y_0, \ldots, Z_k/Y_k]B_{1i}$
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have the same canonical syntax,
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for each $i \in 0 .. k$.
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\end{itemize}

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