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Do not interpret mismatches from pretty-printed $crate as token stream invalidation

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This commit is contained in:
Vadim Petrochenkov 2018-12-11 02:26:31 +03:00
parent 69c66286a9
commit f756257fb7
4 changed files with 50 additions and 60 deletions
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4
src/libsyntax/parse/token.rs
View File

@ -633,7 +633,9 @@ impl Token {
(&Shebang(a), &Shebang(b)) => a == b,
(&Lifetime(a), &Lifetime(b)) => a.name == b.name,
(&Ident(a, b), &Ident(c, d)) => a.name == c.name && b == d,
(&Ident(a, b), &Ident(c, d)) => b == d && (a.name == c.name ||
a.name == keywords::DollarCrate.name() ||
c.name == keywords::DollarCrate.name()),
(&Literal(ref a, b), &Literal(ref c, d)) => {
b == d && a.probably_equal_for_proc_macro(c)

4
src/libsyntax/tokenstream.rs
View File

@ -348,7 +348,9 @@ impl TokenStream {
| TokenTree::Token(_, Token::Semi)
// The pretty printer collapses whitespace arbitrarily and can
// introduce whitespace from `NoDelim`.
| TokenTree::Token(_, Token::Whitespace) => false,
| TokenTree::Token(_, Token::Whitespace)
// The pretty printer can turn `$crate` into `::crate_name`
| TokenTree::Token(_, Token::ModSep) => false,
_ => true
}
}

10
src/test/ui/proc-macro/dollar-crate.stderr
View File

@ -2,7 +2,10 @@ error[E0428]: the name `D` is defined multiple times
--> $DIR/dollar-crate.rs:23:13
|
LL | struct D($crate::S); //~ ERROR the name `D` is defined multiple times
| ^^^^^^^^^^^^^^^^^^^^ `D` redefined here
| ^^^^^^^^^^^^^^^^^^^^
| |
| `D` redefined here
| previous definition of the type `D` here
...
LL | local!();
| --------- in this macro invocation
@ -13,7 +16,10 @@ error[E0428]: the name `D` is defined multiple times
--> $DIR/dollar-crate.rs:31:5
|
LL | dollar_crate_external::external!(); //~ ERROR the name `D` is defined multiple times
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `D` redefined here
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| `D` redefined here
| previous definition of the type `D` here
|
= note: `D` must be defined only once in the type namespace of this module
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

92
src/test/ui/proc-macro/dollar-crate.stdout
View File

@ -42,80 +42,80 @@ ATTRIBUTE INPUT (PRETTY-PRINTED): struct A(crate::S);
ATTRIBUTE INPUT: TokenStream [
Ident {
ident: "struct",
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Ident {
ident: "A",
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "crate",
span: #0 bytes(0..0)
ident: "$crate",
span: #2 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Joint,
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Alone,
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Ident {
ident: "S",
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
}
],
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Punct {
ch: ';',
spacing: Alone,
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
}
]
DERIVE INPUT (PRETTY-PRINTED): struct D(crate::S);
DERIVE INPUT: TokenStream [
Ident {
ident: "struct",
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Ident {
ident: "D",
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "crate",
span: #0 bytes(0..0)
ident: "$crate",
span: #2 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Joint,
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Alone,
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Ident {
ident: "S",
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
}
],
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
},
Punct {
ch: ';',
spacing: Alone,
span: #0 bytes(0..0)
span: #2 bytes(LO..HI)
}
]
PROC MACRO INPUT (PRETTY-PRINTED): struct M ( $crate :: S ) ;
@ -162,99 +162,79 @@ ATTRIBUTE INPUT (PRETTY-PRINTED): struct A(::dollar_crate_external::S);
ATTRIBUTE INPUT: TokenStream [
Ident {
ident: "struct",
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Ident {
ident: "A",
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Punct {
ch: ':',
spacing: Joint,
span: #0 bytes(0..0)
},
Punct {
ch: ':',
spacing: Alone,
span: #0 bytes(0..0)
},
Ident {
ident: "dollar_crate_external",
span: #0 bytes(0..0)
ident: "$crate",
span: #10 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Joint,
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Alone,
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Ident {
ident: "S",
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
}
],
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Punct {
ch: ';',
spacing: Alone,
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
}
]
DERIVE INPUT (PRETTY-PRINTED): struct D(::dollar_crate_external::S);
DERIVE INPUT: TokenStream [
Ident {
ident: "struct",
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Ident {
ident: "D",
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Punct {
ch: ':',
spacing: Joint,
span: #0 bytes(0..0)
},
Punct {
ch: ':',
spacing: Alone,
span: #0 bytes(0..0)
},
Ident {
ident: "dollar_crate_external",
span: #0 bytes(0..0)
ident: "$crate",
span: #10 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Joint,
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Punct {
ch: ':',
spacing: Alone,
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Ident {
ident: "S",
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
}
],
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
},
Punct {
ch: ';',
spacing: Alone,
span: #0 bytes(0..0)
span: #10 bytes(LO..HI)
}
]