Constant variables in dartc

[DartBot]

This issue was originally filed by ms...@unipro.ru

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Support constant variables in the static analyzer.

[madsager]

Could you please give an example with your expectation and describe what the actual behavior is?

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Added Area-Analyzer, NeedsInfo labels.

[DartBot]

This comment was originally written by ms...@unipro.ru

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A simple test:

const x = 1;

main() {
  print(x);
}

Dartc should not produce any warnings or errors.
Actual result is three compile errors on the first line:
Unexpected token 'IDENTIFIER' (expected '(')
The token ';' cannot be used as an identifier
The token 'INTEGER_LITERAL' cannot be used as an identifier

It looks like dartc does not support const as a variable modifier.

[lrhn]

None of the implementations currently support the new const syntax from spec version 0.7, including the constant variable part.
I.e., it's really a bug against VM, dartc and dart2js.

[danrubel]

Added this to the M1 milestone.

[anders-sandholm]

Marked this as being blocked by #3394.

[anders-sandholm]

Added Duplicate label.
Marked as being merged into #3550.