rust/crates/syntax/test_data/parser/ok/0065_comment_newline.rast
Aleksey Kladov 2bf81922f7 internal: more reasonable grammar for blocks
Consider these expples

        { 92 }
  async { 92 }
    'a: { 92 }
   #[a] { 92 }

Previously the tree for them were

  BLOCK_EXPR
    { ... }

  EFFECT_EXPR
    async
    BLOCK_EXPR
      { ... }

  EFFECT_EXPR
    'a:
    BLOCK_EXPR
      { ... }

  BLOCK_EXPR
    #[a]
    { ... }

As you see, it gets progressively worse :) The last two items are
especially odd. The last one even violates the balanced curleys
invariant we have (#10357) The new approach is to say that the stuff in
`{}` is stmt_list, and the block is stmt_list + optional modifiers

  BLOCK_EXPR
    STMT_LIST
      { ... }

  BLOCK_EXPR
    async
    STMT_LIST
      { ... }

  BLOCK_EXPR
    'a:
    STMT_LIST
      { ... }

  BLOCK_EXPR
    #[a]
    STMT_LIST
      { ... }
2021-09-26 19:16:09 +03:00

18 lines
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Plaintext

SOURCE_FILE@0..26
FN@0..25
COMMENT@0..11 "/// Example"
WHITESPACE@11..13 "\n\n"
FN_KW@13..15 "fn"
WHITESPACE@15..16 " "
NAME@16..20
IDENT@16..20 "test"
PARAM_LIST@20..22
L_PAREN@20..21 "("
R_PAREN@21..22 ")"
WHITESPACE@22..23 " "
BLOCK_EXPR@23..25
STMT_LIST@23..25
L_CURLY@23..24 "{"
R_CURLY@24..25 "}"
WHITESPACE@25..26 "\n"