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Add framework for the extern keyword. (#3755)

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This doesn't add full support. I'm separating it out to make the effects
of the modifier changes clearer for review. I'm restructuring a little
with the expectation that we'll have some more categories of modifier
keywords in the future (similar to `extern`, these may not be in a "set"
such as access), and thus easily scaling up to a few more would be
useful.
This commit is contained in:
Jon Ross-Perkins
2024-03-08 16:01:12 +00:00
committed by GitHub
parent 56d70dc3a2
commit 096daecc57
21 changed files with 241 additions and 102 deletions
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toolchain/parse/testdata/function/definition/basic.carbon
Vendored
+9 -2
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@@ -4,8 +4,8 @@
//
// AUTOUPDATE
fn F() {
}
fn F() {}
extern fn G() {}
// CHECK:STDOUT: - filename: basic.carbon
// CHECK:STDOUT: parse_tree: [
@@ -16,5 +16,12 @@ fn F() {
// CHECK:STDOUT: {kind: 'TuplePattern', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'ExternModifier', text: 'extern'},
// CHECK:STDOUT: {kind: 'IdentifierName', text: 'G'},
// CHECK:STDOUT: {kind: 'TuplePatternStart', text: '('},
// CHECK:STDOUT: {kind: 'TuplePattern', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]