proc_macro: Improve Debug representations #49748
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This commit improves the `fmt::Debug` output of `proc_macro` data structures by primarily focusing on the representation exposed by `proc_macro` rather than the compiler's own internal representation. This cuts down quite a bit on assorted wrapper types and ensure a relatively clean output. Closes rust-lang#49720
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src/libproc_macro/lib.rs
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| #[unstable(feature = "proc_macro", issue = "38356")] | ||
| impl fmt::Debug for Span { | ||
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
| write!(f, "{:?} bytes({}...{})", |
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I believe the lo/hi interval is half-open so {}..{} would be more accurate. Like in #49720 the + token is bytes(82..83).
A span covering a single byte, such as for an operator `+` token, should print as e.g. `80..81` rather than `80...81`. The lo end of the range is inclusive and the hi end is exclusive.
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Here is sample debug output for the tokens TokenStream [
Group {
delimiter: Bracket,
stream: TokenStream [
Term {
sym: a,
span: #0 bytes(80..81)
},
Op {
op: '+',
spacing: Alone,
span: #0 bytes(82..83)
},
Literal {
lit: Integer(
1
),
suffix: None,
span: #0 bytes(84..85)
}
],
span: #0 bytes(79..86)
}
]@bors r+ |
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…olnay proc_macro: Improve Debug representations This commit improves the `fmt::Debug` output of `proc_macro` data structures by primarily focusing on the representation exposed by `proc_macro` rather than the compiler's own internal representation. This cuts down quite a bit on assorted wrapper types and ensure a relatively clean output. Closes rust-lang#49720
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Rollup of 9 pull requests Successful merges: - #49510 (Fix anchor position on fields) - #49652 (Fix anchors issue when everything is collapsed) - #49702 (std: Inline some Termination-related methods) - #49728 (add emit_debug_gdb_scripts target option and ..) - #49731 (add THUMB targets to rustup manifest) - #49742 (Using X headings instead of 0.X #49739) - #49748 (proc_macro: Improve Debug representations) - #49750 (bootstrap: Remove the fast path) - #49503 (Inject the `compiler_builtins` crate whenever the `core` crate is injected) Failed merges:
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Apr 13, 2018
| @@ -717,7 +742,8 @@ impl fmt::Display for Term { | |||
| #[derive(Clone, Debug)] | |||
| #[unstable(feature = "proc_macro", issue = "38356")] | |||
| pub struct Literal { | |||
| token: token::Token, | |||
| lit: token::Lit, | |||
| suffix: Option<ast::Name>, | |||
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This commit improves the
fmt::Debugoutput ofproc_macrodata structures byprimarily focusing on the representation exposed by
proc_macrorather than thecompiler's own internal representation. This cuts down quite a bit on assorted
wrapper types and ensure a relatively clean output.
Closes #49720