7f3bd69bd9
Any assignment / compound-assignment whose target chain is ROOTED at a
constant — a const-flagged global (array consts, #run consts) or a
module value const (struct consts incl.) — diagnoses 'cannot assign
through constant X' at compile time. A struct const's field write used
to compile and bus-error at runtime (issue 0116); scalars misfired
silently. A deref along the chain (p.*) breaks the root — pointer
writes stay the documented escape until the const-ness steps; a local
shadowing the const name stays writable.
Also: typed struct constants ('W : Color : Color.{...}') register —
the shape list skipped struct_literal, leaving the typed form
unresolved while the untyped one worked.
Examples: 1162 (all rejection shapes incl. the 0116 crash repro),
0178 (typed struct const reads + copy independence).
24 lines
897 B
Plaintext
24 lines
897 B
Plaintext
error: cannot assign through constant 'WHITE' — constants are immutable (use a '=' global or a local copy for mutable data)
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--> examples/1162-diagnostics-const-write-rejected.sx:15:5
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15 | WHITE.r = 0;
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| ^^^^^^^
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error: cannot assign through constant 'K' — constants are immutable (use a '=' global or a local copy for mutable data)
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--> examples/1162-diagnostics-const-write-rejected.sx:16:5
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16 | K[0] = 5;
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| ^^^^
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error: cannot assign through constant 'K' — constants are immutable (use a '=' global or a local copy for mutable data)
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--> examples/1162-diagnostics-const-write-rejected.sx:17:5
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17 | K[1] += 2;
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| ^^^^
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error: cannot assign through constant 'N' — constants are immutable (use a '=' global or a local copy for mutable data)
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--> examples/1162-diagnostics-const-write-rejected.sx:18:5
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18 | N = 9;
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| ^^^^^^
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