diff options
Diffstat (limited to 'erts/doc/src/absform.xml')
| -rw-r--r-- | erts/doc/src/absform.xml | 79 |
1 files changed, 60 insertions, 19 deletions
diff --git a/erts/doc/src/absform.xml b/erts/doc/src/absform.xml index ab00d47425..d77d989057 100644 --- a/erts/doc/src/absform.xml +++ b/erts/doc/src/absform.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2001</year><year>2016</year> + <year>2001</year><year>2018</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -182,10 +182,18 @@ can contain the following:</p> <list type="bulleted"> - <item>Tuples <c>{error,E}</c> and <c>{warning,W}</c>, denoting - syntactically incorrect forms and warnings</item> - <item><c>{eof,LINE}</c>, denoting an end-of-stream - encountered before a complete form had been parsed</item> + <item> + <p>Tuples <c>{error,E}</c> and <c>{warning,W}</c>, denoting + syntactically incorrect forms and warnings. + </p> + </item> + <item> + <p><c>{eof,LOCATION}</c>, denoting an end-of-stream + encountered before a complete form had been parsed. + The word <c>LOCATION</c> represents an integer, and denotes the + number of the last line in the source file. + </p> + </item> </list> </section> </section> @@ -357,7 +365,7 @@ <c>{cons,LINE,Rep(E_h),Rep(E_t)}</c>.</p> </item> <item> - <p>>If E is a fun expression <c>fun Name/Arity</c>, then Rep(E) = + <p>If E is a fun expression <c>fun Name/Arity</c>, then Rep(E) = <c>{'fun',LINE,{function,Name,Arity}}</c>.</p> </item> <item> @@ -399,9 +407,8 @@ </item> <item> <p>If E is a map creation <c>#{A_1, ..., A_k}</c>, - where each <c>A_i</c> is an association <c>E_i_1 => E_i_2</c> - or <c>E_i_1 := E_i_2</c>, then Rep(E) = - <c>{map,LINE,[Rep(A_1), ..., Rep(A_k)]}</c>. + where each <c>A_i</c> is an association <c>E_i_1 => E_i_2</c>, + then Rep(E) = <c>{map,LINE,[Rep(A_1), ..., Rep(A_k)]}</c>. For Rep(A), see below.</p> </item> <item> @@ -606,26 +613,58 @@ <item> <p>If C is a catch clause <c>P -> B</c>, where <c>P</c> is a pattern and <c>B</c> is a body, then - Rep(C) = <c>{clause,LINE,[Rep({throw,P,_})],[],Rep(B)}</c>.</p> + Rep(C) = <c>{clause,LINE,[Rep({throw,P,_})],[],Rep(B)}</c>, + that is, a catch clause with an explicit exception class + <c>throw</c> and with or without an explicit stacktrace + variable <c>_</c> cannot be distinguished from a catch clause + without an explicit exception class and without an explicit + stacktrace variable.</p> </item> <item> <p>If C is a catch clause <c>X : P -> B</c>, where <c>X</c> is an atomic literal or a variable pattern, <c>P</c> is a pattern, and <c>B</c> is a body, then - Rep(C) = <c>{clause,LINE,[Rep({X,P,_})],[],Rep(B)}</c>.</p> + Rep(C) = <c>{clause,LINE,[Rep({X,P,_})],[],Rep(B)}</c>, + that is, a catch clause with an explicit exception class and + with an explicit stacktrace variable <c>_</c> cannot be + distinguished from a catch clause with an explicit exception + class and without an explicit stacktrace variable.</p> + </item> + <item> + <p>If C is a catch clause <c>X : P : S -> B</c>, + where <c>X</c> is an atomic literal or a variable pattern, + <c>P</c> is a pattern, <c>S</c> is a variable, and <c>B</c> + is a body, then + Rep(C) = <c>{clause,LINE,[Rep({X,P,S})],[],Rep(B)}</c>.</p> </item> <item> <p>If C is a catch clause <c>P when Gs -> B</c>, where <c>P</c> is a pattern, <c>Gs</c> is a guard sequence, and <c>B</c> is a body, then - Rep(C) = <c>{clause,LINE,[Rep({throw,P,_})],Rep(Gs),Rep(B)}</c>.</p> + Rep(C) = <c>{clause,LINE,[Rep({throw,P,_})],Rep(Gs),Rep(B)}</c>, + that is, a catch clause with an explicit exception class + <c>throw</c> and with or without an explicit stacktrace + variable <c>_</c> cannot be distinguished from a catch clause + without an explicit exception class and without an explicit + stacktrace variable.</p> </item> <item> <p>If C is a catch clause <c>X : P when Gs -> B</c>, where <c>X</c> is an atomic literal or a variable pattern, <c>P</c> is a pattern, <c>Gs</c> is a guard sequence, and <c>B</c> is a body, then - Rep(C) = <c>{clause,LINE,[Rep({X,P,_})],Rep(Gs),Rep(B)}</c>.</p> + Rep(C) = <c>{clause,LINE,[Rep({X,P,_})],Rep(Gs),Rep(B)}</c>, + that is, a catch clause with an explicit exception class and + with an explicit stacktrace variable <c>_</c> cannot be + distinguished from a catch clause with an explicit exception + class and without an explicit stacktrace variable.</p> + </item> + <item> + <p>If C is a catch clause <c>X : P : S when Gs -> B</c>, + where <c>X</c> is an atomic literal or a variable pattern, + <c>P</c> is a pattern, <c>Gs</c> is a guard sequence, + <c>S</c> is a variable, and <c>B</c> is a body, then + Rep(C) = <c>{clause,LINE,[Rep({X,P,S})],Rep(Gs),Rep(B)}</c>.</p> </item> <item> <p>If C is a function clause <c>( Ps ) -> B</c>, @@ -691,9 +730,8 @@ </item> <item> <p>If Gt is a map creation <c>#{A_1, ..., A_k}</c>, - where each <c>A_i</c> is an association <c>Gt_i_1 => Gt_i_2</c> - or <c>Gt_i_1 := Gt_i_2</c>, then Rep(Gt) = - <c>{map,LINE,[Rep(A_1), ..., Rep(A_k)]}</c>. + where each <c>A_i</c> is an association <c>Gt_i_1 => Gt_i_2</c>, + then Rep(Gt) = <c>{map,LINE,[Rep(A_1), ..., Rep(A_k)]}</c>. For Rep(A), see above.</p> </item> <item> @@ -763,7 +801,8 @@ <c>{ann_type,LINE,[Rep(A),Rep(T_0)]}</c>.</p> </item> <item> - <p>If T is an atom or integer literal L, then Rep(T) = Rep(L).</p> + <p>If T is an atom, a character, or an integer literal L, + then Rep(T) = Rep(L).</p> </item> <item> <p>If T is a bitstring type <c><<_:M,_:_*N>></c>, @@ -772,7 +811,9 @@ </item> <item> <p>If T is the empty list type <c>[]</c>, then Rep(T) = - <c>{type,Line,nil,[]}</c>.</p> + <c>{type,Line,nil,[]}</c>, that is, the empty list type + <c>[]</c> cannot be distinguished from the predefined type + <c>nil()</c>.</p> </item> <item> <p>If T is a fun type <c>fun()</c>, then Rep(T) = @@ -886,7 +927,7 @@ Rep(Fc) = <c>[Rep(C_1), ..., Rep(C_k)]</c>.</p> <list type="bulleted"> - <item>If C is a constraint <c>is_subtype(V, T)</c> or <c>V :: T</c>, + <item>If C is a constraint <c>V :: T</c>, where <c>V</c> is a type variable and <c>T</c> is a type, then Rep(C) = <c>{type,LINE,constraint,[{atom,LINE,is_subtype},[Rep(V),Rep(T)]]}</c>. |