Support attributes on array members
Array members are allow to have attributes such as `#[cfg]`. This is a bit tricky as we don't know if the first expression is an initializer or a member until we encounter a `;`. This reuses a trick from `stmt` where we remember if we saw an attribute and then raise an error if the first expression ends up being an initializer. This isn't perfect as the error isn't correctly located on the attribute or initializer; it ends up immediately after the `;`.
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@ -170,8 +170,28 @@ fn array_expr(p: &mut Parser) -> CompletedMarker {
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if p.eat(T![']']) {
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return m.complete(p, ARRAY_EXPR);
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}
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// test first_array_member_attributes
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// pub const A: &[i64] = &[
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// #[cfg(test)]
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// 1,
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// 2,
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// ];
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let first_member_has_attrs = p.at(T![#]);
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attributes::outer_attributes(p);
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expr(p);
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if p.eat(T![;]) {
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if first_member_has_attrs {
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// test_err array_length_attributes
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// pub const A: &[i64] = &[
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// #[cfg(test)]
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// 1;
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// 2,
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// ];
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p.error("removing an expression is not supported in this position");
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}
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expr(p);
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p.expect(T![']']);
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return m.complete(p, ARRAY_EXPR);
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@ -181,6 +201,14 @@ fn array_expr(p: &mut Parser) -> CompletedMarker {
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if p.at(T![']']) {
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break;
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}
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// test subsequent_array_member_attributes
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// pub const A: &[i64] = &[
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// 1,
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// #[cfg(test)]
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// 2,
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// ];
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attributes::outer_attributes(p);
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if !p.at_ts(EXPR_FIRST) {
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p.error("expected expression");
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break;
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@ -0,0 +1,5 @@
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pub const A: &[i64] = &[
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#[cfg(test)]
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1;
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2,
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];
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@ -0,0 +1,60 @@
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SOURCE_FILE@[0; 53)
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CONST_DEF@[0; 48)
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VISIBILITY@[0; 3)
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PUB_KW@[0; 3) "pub"
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WHITESPACE@[3; 4) " "
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CONST_KW@[4; 9) "const"
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WHITESPACE@[9; 10) " "
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NAME@[10; 11)
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IDENT@[10; 11) "A"
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COLON@[11; 12) ":"
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WHITESPACE@[12; 13) " "
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REFERENCE_TYPE@[13; 19)
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AMP@[13; 14) "&"
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SLICE_TYPE@[14; 19)
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L_BRACK@[14; 15) "["
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PATH_TYPE@[15; 18)
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PATH@[15; 18)
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PATH_SEGMENT@[15; 18)
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NAME_REF@[15; 18)
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IDENT@[15; 18) "i64"
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R_BRACK@[18; 19) "]"
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WHITESPACE@[19; 20) " "
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EQ@[20; 21) "="
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WHITESPACE@[21; 22) " "
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REF_EXPR@[22; 48)
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AMP@[22; 23) "&"
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ARRAY_EXPR@[23; 48)
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L_BRACK@[23; 24) "["
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WHITESPACE@[24; 27) "\n "
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ATTR@[27; 39)
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POUND@[27; 28) "#"
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TOKEN_TREE@[28; 39)
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L_BRACK@[28; 29) "["
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IDENT@[29; 32) "cfg"
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TOKEN_TREE@[32; 38)
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L_PAREN@[32; 33) "("
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IDENT@[33; 37) "test"
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R_PAREN@[37; 38) ")"
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R_BRACK@[38; 39) "]"
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WHITESPACE@[39; 42) "\n "
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LITERAL@[42; 43)
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INT_NUMBER@[42; 43) "1"
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SEMI@[43; 44) ";"
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WHITESPACE@[44; 47) "\n "
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LITERAL@[47; 48)
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INT_NUMBER@[47; 48) "2"
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ERROR@[48; 49)
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COMMA@[48; 49) ","
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WHITESPACE@[49; 50) "\n"
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ERROR@[50; 51)
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R_BRACK@[50; 51) "]"
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ERROR@[51; 52)
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SEMI@[51; 52) ";"
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WHITESPACE@[52; 53) "\n"
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error 44: removing an expression is not supported in this position
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error 48: expected R_BRACK
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error 48: expected SEMI
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error 48: expected an item
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error 50: expected an item
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error 51: expected an item
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@ -0,0 +1,5 @@
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pub const A: &[i64] = &[
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#[cfg(test)]
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1,
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2,
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];
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@ -0,0 +1,51 @@
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SOURCE_FILE@[0; 56)
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CONST_DEF@[0; 55)
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VISIBILITY@[0; 3)
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PUB_KW@[0; 3) "pub"
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WHITESPACE@[3; 4) " "
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CONST_KW@[4; 9) "const"
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WHITESPACE@[9; 10) " "
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NAME@[10; 11)
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IDENT@[10; 11) "A"
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COLON@[11; 12) ":"
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WHITESPACE@[12; 13) " "
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REFERENCE_TYPE@[13; 19)
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AMP@[13; 14) "&"
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SLICE_TYPE@[14; 19)
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L_BRACK@[14; 15) "["
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PATH_TYPE@[15; 18)
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PATH@[15; 18)
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PATH_SEGMENT@[15; 18)
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NAME_REF@[15; 18)
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IDENT@[15; 18) "i64"
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R_BRACK@[18; 19) "]"
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WHITESPACE@[19; 20) " "
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EQ@[20; 21) "="
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WHITESPACE@[21; 22) " "
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REF_EXPR@[22; 54)
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AMP@[22; 23) "&"
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ARRAY_EXPR@[23; 54)
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L_BRACK@[23; 24) "["
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WHITESPACE@[24; 28) "\n "
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ATTR@[28; 40)
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POUND@[28; 29) "#"
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TOKEN_TREE@[29; 40)
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L_BRACK@[29; 30) "["
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IDENT@[30; 33) "cfg"
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TOKEN_TREE@[33; 39)
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L_PAREN@[33; 34) "("
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IDENT@[34; 38) "test"
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R_PAREN@[38; 39) ")"
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R_BRACK@[39; 40) "]"
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WHITESPACE@[40; 44) "\n "
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LITERAL@[44; 45)
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INT_NUMBER@[44; 45) "1"
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COMMA@[45; 46) ","
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WHITESPACE@[46; 50) "\n "
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LITERAL@[50; 51)
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INT_NUMBER@[50; 51) "2"
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COMMA@[51; 52) ","
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WHITESPACE@[52; 53) "\n"
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R_BRACK@[53; 54) "]"
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SEMI@[54; 55) ";"
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WHITESPACE@[55; 56) "\n"
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@ -0,0 +1,5 @@
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pub const A: &[i64] = &[
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1,
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#[cfg(test)]
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2,
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];
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@ -0,0 +1,51 @@
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SOURCE_FILE@[0; 56)
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CONST_DEF@[0; 55)
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VISIBILITY@[0; 3)
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PUB_KW@[0; 3) "pub"
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WHITESPACE@[3; 4) " "
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CONST_KW@[4; 9) "const"
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WHITESPACE@[9; 10) " "
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NAME@[10; 11)
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IDENT@[10; 11) "A"
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COLON@[11; 12) ":"
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WHITESPACE@[12; 13) " "
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REFERENCE_TYPE@[13; 19)
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AMP@[13; 14) "&"
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SLICE_TYPE@[14; 19)
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L_BRACK@[14; 15) "["
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PATH_TYPE@[15; 18)
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PATH@[15; 18)
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PATH_SEGMENT@[15; 18)
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NAME_REF@[15; 18)
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IDENT@[15; 18) "i64"
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R_BRACK@[18; 19) "]"
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WHITESPACE@[19; 20) " "
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EQ@[20; 21) "="
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WHITESPACE@[21; 22) " "
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REF_EXPR@[22; 54)
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AMP@[22; 23) "&"
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ARRAY_EXPR@[23; 54)
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L_BRACK@[23; 24) "["
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WHITESPACE@[24; 28) "\n "
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LITERAL@[28; 29)
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INT_NUMBER@[28; 29) "1"
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COMMA@[29; 30) ","
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WHITESPACE@[30; 34) "\n "
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ATTR@[34; 46)
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POUND@[34; 35) "#"
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TOKEN_TREE@[35; 46)
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L_BRACK@[35; 36) "["
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IDENT@[36; 39) "cfg"
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TOKEN_TREE@[39; 45)
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L_PAREN@[39; 40) "("
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IDENT@[40; 44) "test"
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R_PAREN@[44; 45) ")"
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R_BRACK@[45; 46) "]"
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WHITESPACE@[46; 50) "\n "
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LITERAL@[50; 51)
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INT_NUMBER@[50; 51) "2"
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COMMA@[51; 52) ","
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WHITESPACE@[52; 53) "\n"
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R_BRACK@[53; 54) "]"
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SEMI@[54; 55) ";"
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WHITESPACE@[55; 56) "\n"
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