Bump quote from 0.6.12 to 1.0.4

[dependabot-preview[bot]]

Bumps quote from 0.6.12 to 1.0.4.

Release notes

Sourced from quote's releases.

1.0.4

• Permit char as a fragment in the format_ident! macro

1.0.3

• Avoid panic when using quote! on raw identifiers (#140)

1.0.2

• Fix missing token if there is a star adjacent to repetition (#130)

1.0.1

• Documentation improvements

1.0.0

This release fixes some longstanding limitations of the quote! macro, bringing quote better in line with the patterns that macro authors are used to from working with macro_rules.

Duplicate interpolations in a repetition

In past versions of quote, interpolating the same variable multiple times inside of one repeating block was not allowed.

For example if we had an iterator of local variable names and wanted the generated code to do a clone of each one, that wouldn't compile:

error[E0416]: identifier `var` is bound more than once in the same pattern
 --> src/main.rs:7:27
  |
7 |         #( let #var = #var.clone(); )*
  |                        ^^^ used in a pattern more than once

Macros usually worked around this by having the same sequence of interpolated values named two different things:

// old workaround 1
let var = input.fields.iter().map(|field| &field.ident);
let var2 = var.clone();
quote! {
#( let #var = #var2.clone(); )*
}

or by giving up on repetitions and doing more of the work within the iterator chain:

// old workaround 2
let var_clones = input
    .fields
    .iter()
</tr></table> ... (truncated)

Commits

• cc50e29 Release 1.0.4
• 56ba5f0 Merge pull request #151 from dtolnay/char
• fb6516a Allow char as a fragment in format_ident
• 53c2e79 Fix rustc version range in readme
• 8543760 Select a single docs.rs build target
• e030093 Release 1.0.3
• 4154389 Make it clearer that __rt isn't public
• 6214797 Update ui tests to nightly-2020-03-01
• 44f1436 Update string escaping test for proc-macro2 1.0.9
• f6753b8 Update ui tests to nightly-2020-02-08
• Additional commits viewable in compare view

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