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reference grammar: loop label should be optional

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This adds missing `?` marks to productions for loops and break/continue.

It also adds missing option label to while let loop
This commit is contained in:
Aleksey Kladov 2015-09-03 22:13:50 +03:00
parent 0762f58c11
commit 83aee74fce
1 changed files with 6 additions and 6 deletions
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12
src/doc/grammar.md
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@ -636,31 +636,31 @@ lambda_expr : '|' ident_list '|' expr ;
### While loops
```antlr
while_expr : [ lifetime ':' ] "while" no_struct_literal_expr '{' block '}' ;
while_expr : [ lifetime ':' ] ? "while" no_struct_literal_expr '{' block '}' ;
```
### Infinite loops
```antlr
loop_expr : [ lifetime ':' ] "loop" '{' block '}';
loop_expr : [ lifetime ':' ] ? "loop" '{' block '}';
```
### Break expressions
```antlr
break_expr : "break" [ lifetime ];
break_expr : "break" [ lifetime ] ?;
```
### Continue expressions
```antlr
continue_expr : "continue" [ lifetime ];
continue_expr : "continue" [ lifetime ] ?;
```
### For expressions
```antlr
for_expr : [ lifetime ':' ] "for" pat "in" no_struct_literal_expr '{' block '}' ;
for_expr : [ lifetime ':' ] ? "for" pat "in" no_struct_literal_expr '{' block '}' ;
```
### If expressions
@ -694,7 +694,7 @@ else_tail : "else" [ if_expr | if_let_expr | '{' block '}' ] ;
### While let loops
```antlr
while_let_expr : "while" "let" pat '=' expr '{' block '}' ;
while_let_expr : [ lifetime ':' ] ? "while" "let" pat '=' expr '{' block '}' ;
```
### Return expressions