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Specify null safety subtyping #3515

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Specify null safety subtyping #3515

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61da6d2
Integrate the null-safety subtyping rules into dartLangSpec.tex
eernstg Dec 14, 2023
f03027e
Integrated null-safety into the appendix about subtyping
eernstg Dec 14, 2023
0fd9980
Fix a couple of typos
eernstg Dec 14, 2023
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27 changes: 15 additions & 12 deletions specification/dart.sty
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Original file line number Diff line number Diff line change
Expand Up @@ -124,11 +124,11 @@
\newenvironment{commentary}[1]{{\color{commentaryColor}\sf{#1}}}{}

% Auxiliary functions.
\newcommand{\flattenName}{\mbox{\it flatten}}
\newcommand{\flattenName}{\metavar{flatten}}
\newcommand{\flatten}[1]{\ensuremath{\flattenName({#1})}}
\newcommand{\futureOrBase}[1]{\ensuremath{\mbox{\it futureOrBase}({#1})}}
\newcommand{\overrides}[1]{\ensuremath{\mbox{\it overrides}({#1})}}
\newcommand{\inherited}[1]{\ensuremath{\mbox{\it inherited}({#1})}}
\newcommand{\futureOrBase}[1]{\ensuremath{\metavar{futureOrBase}({#1})}}
\newcommand{\overrides}[1]{\ensuremath{\metavar{overrides}({#1})}}
\newcommand{\inherited}[1]{\ensuremath{\metavar{inherited}({#1})}}

% Used as a mini-section marker, indicating visibly that a range of
% text (usually just a couple of paragraphs) are concerned with one
Expand Down Expand Up @@ -200,7 +200,11 @@

% Mark a compile-time error in the margin.
\newcommand{\Error}[1]{%
\leavevmode\marginpar{\ensuremath{_{^\ominus}}}{#1}}
\leavevmode\marginpar{\ensuremath{_{\textcolor{red}{^\ominus}}}}{#1}}

% Mark a dynamic error in the margin.
\newcommand{\DynamicError}[1]{%
\leavevmode\marginpar{\textcolor{red}{\Lightning}}{#1}}

% Used to specify comma separated lists of similar symbols.
\newcommand{\List}[3]{\ensuremath{{#1}_{#2},\,\ldots,\ {#1}_{#3}}}
Expand Down Expand Up @@ -402,9 +406,9 @@

% Same as \FunctionTypeNamed except suitable for inline usage, hence omitting
% the spacer argument.
\newcommand{\RawFunctionTypeNamed}[8]{%
\newcommand{\RawFunctionTypeNamed}[9]{%
\RawFunctionType{#1}{#2}{#3}{#4}{%
\FunctionTypeNamedParameters{#5}{#6}{#7}{#8}{r}}}
\FunctionTypeNamedParameters{#5}{#6}{#7}{#8}{#9}}}

% A variant of \FunctionTypeNamed that uses the standard symbols,
% that is, a function type with positional optional parameters which
Expand Down Expand Up @@ -471,11 +475,10 @@
\newcommand{\Supertype}[3]{\ensuremath{{#1}\vdash{#2}\,:>\,{#3}}}
\newcommand{\SupertypeStd}[2]{\Supertype{\Delta}{#1}{#2}}

% Judgment expressing that an assignability relation exists.
\newcommand{\AssignableRelationSymbol}{\ensuremath{\Longleftrightarrow}}
\newcommand{\Assignable}[3]{%
\ensuremath{{#1}\vdash{#2}\,\AssignableRelationSymbol\,{#3}}}
\newcommand{\AssignableStd}[2]{\Assignable{\Gamma}{#1}{#2}}
% Judgment expressing that a subtype and a supertype relation exist.
\newcommand{\MutualSubtype}[3]{\ensuremath{{#1}\vdash{#2}\,<:>\,{#3}}}
\newcommand{\MutualSubtypeStd}[2]{\MutualSubtype{\Delta}{#1}{#2}}
\newcommand{\MutualSubtypeNE}[2]{\ensuremath{{#1}\,<:>\,{#2}}}

% Semantic function delivering the superinterfaces of a class.
\newcommand{\Superinterfaces}[1]{\ensuremath{\metavar{Superinterfaces}({#1})}}
Expand Down