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libsyntax: Disallow struct literals after if, while, match, and

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`for...in`.

Closes #14803.

If you used a structure literal after one of these keywords, surround it
in parentheses.

[breaking-change]
This commit is contained in:
Patrick Walton 2014-06-13 19:09:12 -07:00
parent 575710f6ce
commit 654d6444fe
22 changed files with 147 additions and 37 deletions
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8
src/doc/rust.md
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@ -3004,7 +3004,7 @@ ten_times(|j| println!("hello, {}", j));
### While loops
~~~~ {.ebnf .gram}
while_expr : "while" expr '{' block '}' ;
while_expr : "while" no_struct_literal_expr '{' block '}' ;
~~~~
A `while` loop begins by evaluating the boolean loop conditional expression.
@ -3071,7 +3071,7 @@ A `continue` expression is only permitted in the body of a loop.
### For expressions
~~~~ {.ebnf .gram}
for_expr : "for" pat "in" expr '{' block '}' ;
for_expr : "for" pat "in" no_struct_literal_expr '{' block '}' ;
~~~~
A `for` expression is a syntactic construct for looping over elements
@ -3105,7 +3105,7 @@ for i in range(0u, 256) {
### If expressions
~~~~ {.ebnf .gram}
if_expr : "if" expr '{' block '}'
if_expr : "if" no_struct_literal_expr '{' block '}'
else_tail ? ;
else_tail : "else" [ if_expr
@ -3126,7 +3126,7 @@ then any `else` block is executed.
### Match expressions
~~~~ {.ebnf .gram}
match_expr : "match" expr '{' match_arm * '}' ;
match_expr : "match" no_struct_literal_expr '{' match_arm * '}' ;
match_arm : attribute * match_pat "=>" [ expr "," | '{' block '}' ] ;