proc-macro-error 0.4.8

Almost drop-in replacement to panics in proc-macros
Documentation 
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error: emit!(span, from) test
 --> $DIR/emit.rs:4:7
  |
4 | emit!(one, two, three, four);
  |       ^^^

error: emit!(span, expr1, expr2) test
 --> $DIR/emit.rs:4:12
  |
4 | emit!(one, two, three, four);
  |            ^^^

error: emit!(span, single_expr) test
 --> $DIR/emit.rs:4:17
  |
4 | emit!(one, two, three, four);
  |                 ^^^^^

error: Diagnostic::emit() test
 --> $DIR/emit.rs:4:24
  |
4 | emit!(one, two, three, four);
  |                        ^^^^

error: This is an error

  = note: simple note
  = help: simple help
  = help: simple hint
  = note: simple yay
  = note: format note
  = note: Some note
  = note: spanned simple note
  = note: spanned format note
  = note: Some note

 --> $DIR/emit.rs:5:13
  |
5 | emit_notes!(one, two);
  |             ^^^