The PR branch had merge conflicts with `devel` due to a major compiler
refactoring that extracted type definitions from `compiler/ast.nim` into
a new `compiler/astdef.nim` file.
## Changes
- Resolved conflict in `compiler/ast.nim` by accepting `devel`'s
refactored structure
- Merged 763 commits from `devel` branch (commit range:
`ce6a345..b3273e7`)
- Preserved original PR changes removing deprecated symbols from
`lib/core/macros.nim`
The core PR functionality (removal of deprecated macros API since
v0.18.1) remains intact while incorporating the upstream AST
refactoring.
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* Breaking parser changes, implement https://github.com/nim-lang/RFCs/issues/442
Types are separated from expressions and better reflected in the grammar.
* add test
* more accurate grammar
* fix keyword typedescs
* accept expressions in proc argument lists
* CI "fixes"
* fixes
* allow full ref expressions again, adapt old tests
* cleanup, fix some tests
* improve grammar, try and revert semtypes change
* restrict sigil binding to identOrLiteral
* fix, should have caught this immediately
* add changelog entry, fix double not nil bug
* correct grammar
* change section
* fix
* real fix hopefully
* fix test
* support LL(1) for tuples
* make grammar.txt too
